Details of a Researcher - Okamura, Tomonori

Papers - Okamura, Tomonori

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Corrigendum to “Lipoprotein-associated phospholipase A2 is related to risk of subclinical atherosclerosis but is not supported by Mendelian randomization analysis in a general Japanese population.” [Atherosclerosis 246 (March 2016) 141–147]

Ueshima Hirotsugu, Kadowaki Takashi, Hisamatsu Takashi, Fujiyoshi Akira, Miura Katsuyuki, Ohkubo Takayoshi, Sekikawa Akira, Kadota Aya, Kadowaki Sayaka, Nakamura Yasuyuki, Miyagawa Naoko, Okamura Tomonori, Kita Yoshikuni, Takashima Naoyuki, Kashiwagi Atsunori, Maegawa Hiroshi, Horie Minoru, Yamamoto Takashi, Kimura Takeshi, Kita Toru

Atherosclerosis 2018.01

ISSN 0021-9150

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Differences in Lifestyle Improvements With the Intention to Prevent Cardiovascular Diseases by Socioeconomic Status in a Representative Japanese Population

Goryoda Sayuri, Nishi Nobuo, Hozawa Atsushi, Yoshita Katsushi, Arai Yusuke, Kondo Keiko, Miyagawa Naoko, Hayakawa Takehito, Fujiyoshi Akira, Kadota Aya, Ohkubo Takayoshi, Okamura Tomonori, Okuda Nagako, Ueshima Hirotsugu, Okayama Akira, Miura Katsuyuki

Journal of Epidemiology 28 S35 - S39 2018.01

ISSN 0917-5040

BACKGROUND: The relationships among socioeconomic status and lifestyle improvements have not yet been examined in a representative Japanese population.METHODS: We analyzed data from 2,647 participants (1,087 men and 1,560 women) who participated in NIPPON DATA2010. This survey inquired about lifestyle improvements and socioeconomic status. Education was categorized as low (≤9 years), middle (10-12 years), and high (≥13 years). Marital status was categorized as married, divorced, widowed, and never married/other. A multivariable logistic regression model was used to calculate the odds ratios (ORs) and 95% confidence intervals (CIs) of lifestyle improvements with the intention of preventing cardiovascular diseases for educational attainment and marital status, with adjustments for age and awareness of cardiovascular disease risk factors.RESULTS: Overall, 1,507 (56.9%) participants practiced prevention and improvements in hypertension, diabetes, elevated cholesterol, and metabolic syndrome, and the OR of lifestyle improvements was significantly higher with a high education than with a low education in men (OR 2.86; 95% CI, 1.96-4.17) and women (OR 2.36; 95% CI, 1.67-3.33). The number of participants who practiced prevention and improvements in hypertension, diabetes, elevated cholesterol, and metabolic syndrome was significantly lower in divorced than in married men (OR 0.46; 95% CI, 0.22-0.95) and women (OR 0.53; 95% CI, 0.33-0.86).CONCLUSIONS: Specific differences caused by educational attainment and marital status may exist in lifestyle improvements.

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Factors Related to Participation in Health Examinations for Japanese National Health Insurance

Imamura Haruhiko, Kogure Mana, Kita Yoshikuni, Nakagawa Hideaki, Hozawa Atsushi, Okamura Tomonori, Murakami Yoshitaka, Nishi Nobuo, Okuda Nagako, Kadota Aya, Ohkubo Takayoshi, Ueshima Hirotsugu, Okayama Akira, Miura Katsuyuki

Journal of Epidemiology 28 S53 - S58 2018.01

ISSN 0917-5040

BACKGROUND: This study investigated relationships among socioeconomic factors and participation in health examinations for Japanese National Health Insurance (NHI) using a representative Japanese population.METHODS: We used the linkage database of NIPPON DATA2010 and Comprehensive Survey of Living Conditions 2010. Participants with NHI aged 40-74 years were included in the analysis. Prevalence ratios (PRs) for participation in health examinations in the past year were set as an outcome. Participant characteristics, including sex, age, socioeconomic factors (educational attainment, employment, equivalent household expenditure [EHE], house ownership, and marital status), laboratory measures, and lifestyle were included in an age-stratified modified Poisson regression analysis to examine relationships.RESULTS: The number of study participants was 812, and 564 (69.5%) participated in health examinations in the past year. Among those aged 40-64 years, there was no significant PR for socioeconomic factors. Among those aged 65-74 years, high (≥13 years) educational attainment (adjusted PR, 1.22; 95% confidence interval [CI], 1.05-1.41) and house ownership (PR 1.40; 95% CI, 1.11-1.77) were positively associated with participation, while high (4th quartile) EHE (PR 0.84; 95% CI, 0.73-0.97) was negatively associated.CONCLUSION: These results suggest that high educational attainment, house ownership, and low EHE were positive factors for participation in health examinations among those aged 65-74 years.

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Fatty liver index predicts incident diabetes in a Japanese general population with and without impaired fasting glucose

Hirata Aya, Sugiyama Daisuke, Kuwabara Kazuyo, Hirata Takumi, Tsutatani Hiromi, Funamoto Mika, Watanabe Kouiti, Miyamatsu Naomi, Okamura Tomonori

Hepatology Research (Hepatology Research) 48 ( 9 ) 708 - 716 2018.01

Research paper (scientific journal), ISSN 1386-6346

Aim: Fatty liver is associated with the development of diabetes. However, to our knowledge, no study has examined the relationship between the fatty liver index (FLI), calculated scores of hepatic steatosis, and the development of diabetes among individuals without impaired fasting glucose (IFG). We aimed to examine whether FLI predicts the development of diabetes in individuals with and without IFG in a Japanese general population. Methods: We selected 1498 men and 2941 women who participated in Specific Health Checkups in Japan. We divided all participants into six groups according to tertiles of FLI (low, moderate, and high) and the presence or absence of IFG, by sex. We calculated hazard ratios for incident diabetes for each group using a Cox proportional hazard model, adjusting for potential confounders. Results: During a mean follow-up period of 3.0 years, 176 cases of diabetes in men and 320 cases in women were identified. Compared with the low FLI group without IFG, the high FLI group without IFG was significantly associated with incident diabetes in both men (hazard ratio, 1.90; 95% confidence interval, 1.08-3.36) and women (hazard ratio, 1.72; 95% confidence interval, 1.18-2.51). All IFG groups were significantly associated with incident diabetes regardless of FLI levels. Conclusions: Our results showed that FLI is associated with the development of diabetes regardless of sex and the presence or absence of IFG, and that it may be a useful predictor of future risk of incident diabetes even in individuals without IFG.

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Guidelines for diagnosis and treatment of familial hypercholesterolemia 2017

Harada-Shiba Mariko, Arai Hidenori, Ishigaki Yasushi, Ishibashi Shun, Okamura Tomonori, Ogura Masatsune, Dobashi Kazushige, Nohara Atsushi, Bujo Hideaki, Miyauchi Katsumi, Yamashita Shizuya, Yokote Koutaro

Journal of Atherosclerosis and Thrombosis 25 ( 8 ) 751 - 770 2018.01

ISSN 1340-3478

Statement 1. Familial hypercholesterolemia (FH) is an autosomal hereditary disease with the 3 major clinical features of hyper-LDL-cholesterolemia, premature coronary artery disease and tendon and skin xanthomas. As there is a considerably high risk of coronary artery disease (CAD), in addition to early diagnosis and intensive treatment, family screening (cascade screening) is required (Recommendation level A) 2. For a diagnosis of FH, at least 2 of the following criteria should be satisfied: ① LDL-C ≥180 mg/dL, ② Tendon/skin xanthomas, ③ History of FH or premature CAD within 2nd degree blood relatives (Recommendation level A) 3. Intensive lipid-lowering therapy is necessary for the treatment of FH. First-line drug should be statins. (Rec-ommendation level A, Evidence level 3) 4. Screening for CAD as well as asymptomatic atherosclerosis should be conducted periodically in FH patients. (Recommendation level A) 5. For homozygous FH, consider LDL apheresis and treatment with PCSK9 inhibitors or MTP inhibitors. (Rec-ommendation level A) 6. For severe forms of heterozygous FH who have resistant to drug therapy, consider PCSK9 inhibitors and LDL apheresis. (Recommendation level A) 7. Refer FH homozygotes as well as heterozygotes who are resistant to drug therapy, who are children or are pregnant or have the desire to bear children to a specialist. (Recommendation level A).

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The National Integrated Project for Prospective Observation of Non-communicable Disease and its Trends in the Aged 2010 (NIPPON DATA2010): Objectives, Design, and Population Characteristics

Kadota A., Okuda N., Ohkubo T., Okamura T., Nishi N., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S2 - S9 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: The structure and risk factors for cardiovascular diseases (CVD) in Japan may change because lifestyle, particularly nutrition, socioeconomic status, and medical care, which affect CVD, may markedly change over time. Therefore, a new prospective cohort study on a representative general Japanese population based on national surveys is required.METHODS: In November 2010, the baseline survey of the National Integrated Project for Prospective Observation of Non-communicable Disease and its Trends in the Aged 2010 (NIPPON DATA2010) was performed with the National Health and Nutrition Survey of Japan (NHNS2010) in 300 randomly selected districts throughout Japan. The survey included a questionnaire, electrocardiogram, urinalysis, and blood biomarkers added to the NHNS2010 examinations. Physical measurements, blood biomarkers, and dietary data were also obtained in NHNS2010. Socioeconomic factors were obtained by merging with the Comprehensive Survey of Living Conditions 2010 (CSLC2010) dataset. Participants are followed annually for the incidence of diabetes mellitus, CVD events (acute coronary events, heart failure, atrial fibrillation, and stroke), and cause-specific mortality. The activities of daily living are followed every 5 years.RESULTS: A total of 2,898 individuals aged 20 years or older agreed to participate in the baseline survey of NIPPON DATA2010. The participation rate was 74.6%. Of these, data from NHNS2010 was merged for 2,891 participants (1,236 men and 1,655 women). The data of 2,807 participants were also merged with CSLC2010 data.CONCLUSIONS: We established NIPPON DATA2010 as a cohort study on a representative general Japanese population that covers all of Japan.

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Socioeconomic Status Associated With Urinary Sodium and Potassium Excretion in Japan: NIPPON DATA2010

Miyagawa N., Okuda N., Nakagawa H., Takezaki T., Nishi N., Takashima N., Fujiyoshi A., Ohkubo T., Kadota A., Okamura T., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S29 - S34 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: Although socioeconomic status (SES) may affect food and nutrient intakes, few studies have reported on sodium (Na) and potassium (K) intakes among individuals with various SESs in Japan. We investigated associations of SES with Na and K intake levels using urinary specimens in a representative Japanese population.METHODS: This was a cross-sectional study of 2,560 men and women (the NIPPON DATA2010 cohort) who participated in the National Health and Nutrition Survey Japan in 2010. Casual urine was used to calculate estimated excretion in 24-hour urinary Na (E24hr-Na) and K (E24hr-K). The urinary sodium-to-potassium (Na/K) ratio was calculated from casual urinary electrolyte values. An analysis of covariance was performed to investigate associations of aspects of SES, including equivalent household expenditure (EHE), educational attainment, and job category, with E24hr-Na, E24hr-K, and the Na/K ratio for men and women separately. A stratified analysis was performed on educational attainment and the job category for younger (<65 years) and older (≥65 years) participants.RESULTS: In men and women, average E24hr-Na was 176.2 mmol/day and 172.3, average E24hr-K was 42.5 and 41.3, and the average Na/K ratio was 3.61 and 3.68, respectively. Lower EHE was associated with a higher Na/K ratio in women and lower E24hr-K in men and women. A shorter education was associated with a higher Na/K ratio in women and younger men, and lower E24hr-K in older men and women.CONCLUSION: Lower EHE and a shorter education were associated with a lower K intake and higher Na/K ratio estimated from casual urine specimens in Japanese men and women.

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Socioeconomic Status and Knowledge of Cardiovascular Risk Factors: NIPPON DATA2010

Tsuji M., Arima H., Ohkubo T., Nakamura K., Takezaki T., Sakata K., Okuda N., Nishi N., Kadota A., Okamura T., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S46 - S52 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: The relationship between socioeconomic status (SES) and knowledge of cardiovascular risk factors remains unknown in a general Japanese population.METHODS: Of 8,815 participants from 300 randomly selected areas throughout Japan, 2,467 participants who were free of cardiovascular disease and who provided information on SES in the National Health and Nutrition Survey of Japan 2010 were enrolled in this cross-sectional analysis. SES was classified according to the employment status, length of education, marital and living statuses, and equivalent household expenditure (EHE). Outcomes were ignorance of each cardiovascular risk factor (hypertension, diabetes, hypercholesterolemia, low high-density lipoprotein [HDL] cholesterol, arrhythmia, and smoking) and insufficient knowledge (number of correct answers <4 out of 6).RESULTS: A short education and low EHE were significantly associated with a greater ignorance of most cardiovascular risk factors. A short education (<10 years) was also associated with insufficient knowledge of overall cardiovascular risk factors: age- and sex-adjusted odds ratios (OR) were 1.92 (95% confidence interval [CI], 1.51-2.45) relative to participants with ≥13 years of education. Low EHE was also associated with insufficient knowledge (age- and sex-adjusted OR 1.24; 95% CI, 1.01-1.51 for the lowest quintile vs the upper 4 quintiles). These relationships remained significant, even after further adjustments for regular exercise, smoking, weekly alcohol consumption, body mass index, hypertension, diabetes mellitus, hypercholesterolemia, and low HDL cholesterol.CONCLUSION: Participants with a short education and low EHE were more likely to have less knowledge of cardiovascular risk factors.

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Socioeconomic Inequalities in Oral Health among Middle-Aged and Elderly Japanese: NIPPON DATA2010

Murakami K., Ohkubo T., Nakamura M., Ninomiya T., Ojima T., Shirai K., Nagahata T., Kadota A., Okuda N., Nishi N., Okamura T., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S59 - S65 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: Most studies on socioeconomic inequalities in oral health have not considered the effects of behavioral and biological factors and age differences. Furthermore, the nationwide status of inequalities remains unclear in Japan.METHODS: We analyzed data from 2,089 residents aged ≥40 years throughout Japan. The lowest quartile of the number of remaining teeth for each 10-year age category was defined as poor oral health. Behavioral and biological factors included smoking status, obesity, diabetes mellitus, high-sensitivity C-reactive protein, and the use of dental devices. Multiple logistic regression analyses were conducted to examine the associations of educational attainment and equivalent household expenditure (EHE) with oral health, and stratified analyses by age category were also conducted (40-64 years and ≥65 years).RESULTS: Lower education and lower EHE were significantly associated with an increased risk of poor oral health after adjusting for age, sex, employment status, marital and living statuses, and EHE/education; the odds ratio for junior high school education compared with ≥college education was 1.84 (95% confidence interval [CI], 1.36-2.49), and the odds ratio of the lowest compared with the highest EHE quartile was 1.91 (95% CI, 1.43-2.56). Further adjustments for behavioral and biological factors attenuated but did not eliminate these associations. EHE was significantly associated with oral health among elderly adults only, with a significant interaction by age category.CONCLUSIONS: Those with a lower education and those with lower EHE had a significantly higher risk of poor oral health, even after adjustments for behavioral and biological factors.

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Relationships among Food Group Intakes, Household Expenditure, and Education Attainment in a General Japanese Population: NIPPON DATA2010

Nagahata T., Nakamura M., Ojima T., Kondo I., Ninomiya T., Yoshita K., Arai Y., Ohkubo T., Murakami K., Nishi N., Murakami Y., Takashima N., Okuda N., Kadota A., Miyagawa N., Kondo K., Okamura T., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S23 - S28 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: A lower socioeconomic status (SES) may be related to the intake of unhealthy food; however, this relationship has not been examined in detail. This study was undertaken to examine relationships among food group intakes and SES in a representative Japanese population.METHODS: This was a cross-sectional study using the baseline data of NIPPON DATA2010, which is a prospective cohort study of the National Health and Nutrition Survey in Japan. A total of 2,898 participants were included in the baseline survey in 2010. The effects of age (<65 years and ≥65 years), equivalent household expenditure (EHE), and education attainment on food group intakes (gram per 1,000 kcal) were analyzed using a two-way analysis of variance.RESULTS: When EHE was lower, cereal intake was higher in men and women. Among men, fish, milk, and alcohol intakes were reduced with lower EHE. Among women, vegetable intake was reduced with lower EHE. In men and women, cereal intake was higher with lower education attainment. In contrast, meat intake was reduced with lower education attainment.CONCLUSIONS: Lower SES was associated with a higher cereal intake and lower vegetable, fish, meat, and milk intakes in a representative Japanese population. Socioeconomic discrepancies need to be considered in order to promote healthier dietary habits.

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Relationship Between Socioeconomic Status and the Prevalence of Underweight, Overweight or Obesity in a General Japanese Population: NIPPON DATA2010

Nakamura T., Nakamura Y., Saitoh S., Okamura T., Yanagita M., Yoshita K., Kita Y., Murakami Y., Yokomichi H., Nishi N., Okuda N., Kadota A., Ohkubo T., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S10 - S16 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: Socioeconomic status (SES) imbalances in developed and developing countries may result in individuals being overweight and obese. However, few studies have investigated this issue in Japan. We herein examined the relationship between SES and being underweight, overweight or obese according to sex and age groups (20-64 or ≥65 years) in Japan.METHODS: In 2010, we established a cohort of participants in the National Health and Nutrition Survey of Japan. We divided 2,491 participants (1,081 men and 1,410 women) according to the WHO definitions of underweight, overweight or obesity and performed multinomial logistic analyses using BMI <18.5 kg/m2 (underweight), BMI 25.0-29.9 kg/m2 (overweight), and BMI ≥30.0 kg/m2 (obese) versus BMI 18.5-24.9 kg/m2 (normal) as the outcome, with SES groups as the main explanatory variables.RESULTS: In adult men, a lower education level relative to a higher education level was inversely associated with obesity after adjustments for other SESs (odds ratio [OR] 0.41; 95% confidence interval [CI], 0.18-0.96). However, in adult women, lower education level was positively associated with being overweight and obese (OR 1.67; 95% CI, 1.07-2.49 for overweight and OR 2.66; 95% CI, 1.01-7.01 for obese). In adult women, a lower household income was positively associated with being overweight and obese (obese: OR 4.84; 95% CI, 1.36-17.18 for those with a household income <2 million JPY relative to those with ≥6 million JPY).CONCLUSIONS: In adult women, a lower education level and lower household income were positively associated with being overweight or obese. In contrast, in adult men, a lower education level was inversely associated with obesity. Gender and age differences in SESs affect the prevalence of being overweight or obese.

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Macronutrient Intake and Socioeconomic Status: NIPPON DATA2010

Sakurai M., Nakagawa H., Kadota A., Yoshita K., Nakamura Y., Okuda N., Nishi N., Miyamoto Y., Arima H., Ohkubo T., Okamura T., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S17 - S22 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: This study examined the relationships among household income, other SES indicators, and macronutrient intake in a cross-sectional study of a representative Japanese population.METHODS: In 2010, we established a cohort of participants in the National Health and Nutrition Survey (NHNS) from 300 randomly selected areas throughout Japan. A total of 2,637 participants (1,145 men and 1,492 women) were included in the study. Data from NHNS2010 and the Comprehensive Survey of Living Conditions 2010 (CSCL2010) were merged, and relationships among macronutrient intake and SES were evaluated. Additionally, socioeconomic factors associated with a risk of a higher carbohydrate/lower fat intake beyond dietary recommendations were evaluated.RESULTS: Household income was positively associated with fat intake (P = 0.001 for men and <0.001 for women) and inversely associated with carbohydrate intake (P = 0.003 for men and <0.001 for women) after adjustments for age and other SES variables. Similar relationships were observed between equivalent household expenditure (EHE) and macronutrient intake; however, these relationships were weaker than those of household income. Older age was the factor most strongly associated with a high carbohydrate/low fat intake, followed by household income, EHE, education levels, and occupation type.CONCLUSIONS: Older age was the factor most strongly associated with a high carbohydrate/low fat intake, and some aspects of SES, such as household income, EHE, education levels, and occupation type, were independently associated with an imbalanced macronutrient intake. SES may affect the health status of individuals through the intake of macronutrients.

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Japan Atherosclerosis Society (JAS) guidelines for prevention of atherosclerotic cardiovascular diseases 2017

Kinoshita M., Yokote K., Arai H., Iida M., Ishigaki Y., Ishibashi S., Umemoto S., Egusa G., Ohmura H., Okamura T., Kihara S., Koba S., Saito I., Shoji T., Daida H., Tsukamoto K., Deguchi J., Dohi S., Dobashi K., Hamaguchi H., Hara M., Hiro T., Biro S., Fujioka Y., Maruyama C., Miyamoto Y., Murakami Y., Yokode M., Yoshida H., Rakugi H., Wakatsuki A., Yamashita S., Okamura T., Daida H., Ninomiya T., Hozawa A., Yokode M., Iida M., Hasegawa K., Hara M., Yamato H., Shoji T., Abe T., Emoto M., Kashihara N., Saiki A., Tomiyama H., Hashimoto J., Hosomi N., Yamazaki Y., Bujo H., Inoue I., Inoue S., Koba S., Sawada S., Sone H., Hiro S., Funabashi T., Matsumoto M., Ohtsuki T., Kitagawa K., Kitazono T., Terayama Y., Tomimoto H., Toyoda K., Harada-Shiba M., Arai H., Ishibashi S., Nohara A., Ohta T., Ogura M., Ohtake A.

Journal of Atherosclerosis and Thrombosis (Journal of Atherosclerosis and Thrombosis) 25 ( 9 ) 846 - 984 2018

Research paper (scientific journal), ISSN 13403478

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Imamura H., Kogure M., Kita Y., Nakagawa H., Hozawa A., Okamura T., Murakami Y., Nishi N., Okuda N., Kadota A., Ohkubo T., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S53 - S58 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: This study investigated relationships among socioeconomic factors and participation in health examinations for Japanese National Health Insurance (NHI) using a representative Japanese population.METHODS: We used the linkage database of NIPPON DATA2010 and Comprehensive Survey of Living Conditions 2010. Participants with NHI aged 40-74 years were included in the analysis. Prevalence ratios (PRs) for participation in health examinations in the past year were set as an outcome. Participant characteristics, including sex, age, socioeconomic factors (educational attainment, employment, equivalent household expenditure [EHE], house ownership, and marital status), laboratory measures, and lifestyle were included in an age-stratified modified Poisson regression analysis to examine relationships.RESULTS: The number of study participants was 812, and 564 (69.5%) participated in health examinations in the past year. Among those aged 40-64 years, there was no significant PR for socioeconomic factors. Among those aged 65-74 years, high (≥13 years) educational attainment (adjusted PR, 1.22; 95% confidence interval [CI], 1.05-1.41) and house ownership (PR 1.40; 95% CI, 1.11-1.77) were positively associated with participation, while high (4th quartile) EHE (PR 0.84; 95% CI, 0.73-0.97) was negatively associated.CONCLUSION: These results suggest that high educational attainment, house ownership, and low EHE were positive factors for participation in health examinations among those aged 65-74 years.

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Differences in Lifestyle Improvements With the Intention to Prevent Cardiovascular Diseases by Socioeconomic Status in a Representative Japanese Population: NIPPON DATA2010

Goryoda S., Nishi N., Hozawa A., Yoshita K., Arai Y., Kondo K., Miyagawa N., Hayakawa T., Fujiyoshi A., Kadota A., Ohkubo T., Okamura T., Okuda N., Ueshima H., Okayama A., Miura K.

Journal of epidemiology (Journal of epidemiology) 28 ( Suppl 3 ) S35 - S39 2018

Research paper (scientific journal), ISSN 0917-5040

BACKGROUND: The relationships among socioeconomic status and lifestyle improvements have not yet been examined in a representative Japanese population.METHODS: We analyzed data from 2,647 participants (1,087 men and 1,560 women) who participated in NIPPON DATA2010. This survey inquired about lifestyle improvements and socioeconomic status. Education was categorized as low (≤9 years), middle (10-12 years), and high (≥13 years). Marital status was categorized as married, divorced, widowed, and never married/other. A multivariable logistic regression model was used to calculate the odds ratios (ORs) and 95% confidence intervals (CIs) of lifestyle improvements with the intention of preventing cardiovascular diseases for educational attainment and marital status, with adjustments for age and awareness of cardiovascular disease risk factors.RESULTS: Overall, 1,507 (56.9%) participants practiced prevention and improvements in hypertension, diabetes, elevated cholesterol, and metabolic syndrome, and the OR of lifestyle improvements was significantly higher with a high education than with a low education in men (OR 2.86; 95% CI, 1.96-4.17) and women (OR 2.36; 95% CI, 1.67-3.33). The number of participants who practiced prevention and improvements in hypertension, diabetes, elevated cholesterol, and metabolic syndrome was significantly lower in divorced than in married men (OR 0.46; 95% CI, 0.22-0.95) and women (OR 0.53; 95% CI, 0.33-0.86).CONCLUSIONS: Specific differences caused by educational attainment and marital status may exist in lifestyle improvements.

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Associations of high-density lipoprotein particle and high-density lipoprotein cholesterol with alcohol intake, smoking, and body mass index: The INTERLIPID study

Zaid M., Miura K., Okayama A., Nakagawa H., Sakata K., Saitoh S., Okuda N., Yoshita K., Choudhury S., Rodriguez B., Masaki K., Willcox B., Miyagawa N., Okamura T., Chan Q., Elliott P., Stamler J., Ueshima H.

Circulation Journal (Circulation Journal) 82 ( 10 ) 2557 - 2565 2018

Research paper (scientific journal), ISSN 13469843

© 2018, Japanese Circulation Society. All rights reserved. Background: Recently, high-density lipoprotein particles (HDL-P) have been found to be more strongly inversely associated with coronary artery disease (CAD) risk than their counterpart, HDL cholesterol (HDL-C). Given that lifestyle is among the first targets in CAD prevention, we compared the associations of HDL-P and HDL-C with selected lifestyle factors. Methods and Results: We examined 789 Japanese participants of the INTERLIPID Study: men (n=386) and women (n=403) aged 40–59 years in 1996–1998. Participants treated for dyslipidemias were excluded. Lifestyle factors included alcohol intake, smoking amount, and body mass index (BMI). Multivariable linear regression was used for cross-sectional analyses of these factors with HDL-P, HDL-C, HDL-P size subclasses (small, medium and large) and mean HDL-P size. In men, higher alcohol intake was associated with higher HDL-P and higher HDL-C. The associations of alcohol, however, were strongest with HDL-P. A higher smoking amount tended to be associated with lower HDL-P and HDL-C. In contrast, BMI was not associated with HDL-P, but was strongly inversely associated with HDL-C. While alcohol intake favored larger mean HDL-P size, smoking and BMI favored a lipid profile with smaller HDL-P subclasses and overall smaller mean HDL-P size. Similar, but generally weaker results were observed in women. Conclusions: Although both HDL-P and HDL-C are parameters of HDL, they have different associations with alcohol, smoking and BMI.

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Associations between socioeconomic status and the prevalence and treatment of hypercholesterolemia in a general Japanese population: NIPPON DATA2010

Fujiyoshi N., Arima H., Satoh A., Ojima T., Nishi N., Okuda N., Kadota A., Ohkubo T., Hozawa A., Nakaya N., Fujiyoshi A., Okamura T., Ueshima H., Okayama A., Miura K., Saitoh S., Sakata K., Hayakawa T., Yanagawa H., Nakamura Y., Kasagi F., Murakami Y., Izumi T., Matsumura Y., Tokudome S., Toyoshima H., Nakagawa H., Kita Y., Miyamatsu N., Nakamura Y., Yoshita K., Miyamoto Y., Kodama K., Kiyohara Y., Ueda K.

Journal of Atherosclerosis and Thrombosis (Journal of Atherosclerosis and Thrombosis) 25 ( 7 ) 606 - 620 2018

Research paper (scientific journal), ISSN 13403478

© 2018 Japan Atherosclerosis Society. Aim: To investigate associations between socioeconomic status (SES) and the prevalence and treatment status of hypercholesterolemia in a general Japanese population. Methods: In 2010, we established a cohort study of 2417 adults (age 20-91 yr) from 300 randomly selected areas across Japan who participated in the National Health and Nutrition Survey of Japan. We cross-sectionally examined an association between SES and (1) prevalence of hypercholesterolemia in 2417 participants (999 men and 1418 women) and (2) not receiving medication for hypercholesterolemia in 654 participants (215 men and 439 women). SES included employment status, marital status, length of education, and household expenditures. Hypercholesterolemia was defined as a total serum cholesterol level of ≥ 6.21 mmol/L (240 mg/dL) or the use of lipid-lowering medications. Results: The overall prevalence of hypercholesterolemia was 21.5% in men and 31.0% in women. In men, the lowest quintile of household expenditures was associated with a higher prevalence of hypercholesterolemia (28.3%) compared with the upper 4 quintiles (19.9%) (multivariable-adjusted odds ratio 1.66; 95% confidence interval [CI] 1.16-2.38). Among participants with hypercholesterolemia, 55.4% of men and 55.1% of women were not receiving medication. Unmarried men were more likely to be untreated (75.0%) than married men (50.9%) (multivariable-adjusted odds ratio 2.53; 95%CI 1.05-6.08). SES had no significant effects in women. Conclusion: In a general population of Japanese men, low household expenditures were associated with a higher prevalence of hypercholesterolemia, and unmarried men with hypercholesterolemia were less likely to receive medication.

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Re-evaluation of the associations of egg intake with serum total cholesterol and cause-specific and total mortality in Japanese women

Nakamura Yasuyuki, Okamura Tomonori, Kita Yoshikuni, Okuda Nagako, Kadota Aya, Miura Katsuyuki, Okayama Akira, Ueshima Hirotsugu

European Journal of Clinical Nutrition (European Journal of Clinical Nutrition) 72 ( 6 ) 1 - 7 2017.12

Research paper (scientific journal), ISSN 0954-3007

Abstract: Background/objective: Egg intake was associated with serum total cholesterol adjusted for age (aTCH) and total mortality in women, but not in men, using data from NIPPON DATA (ND) 80 which followed up for 14 years. Re-evaluation of these associations in a different cohort is needed. Abstract: Subject/methods: We analyzed the associations of egg intake with aTCH and cause-specific and total mortality using the ND90 data set with a 15-year follow-up. A nutritional examination was done at the baseline in 1990 using the food-frequency method and by weighed food records. We followed 4686 female participants (ages ≥30 years), with no history of stroke or myocardial infarction (mean age 52.8 years) for 15 years. Abstract: Results: The participants were divided into 5 egg intake groups (<1/w, 1–2/w, 1/2d, 1/d, and ≥2/d). There were 203, 1462, 1594, 1387, and 40 women in each group, respectively. Egg intake was not associated with aTCH (P = 0.886). There were 183 cardiovascular disease (CVD), 210 cancer, and 599 total mortality cases during follow-up. Cox analysis, adjusted for background factors, found egg intake was directly associated with total and cancer mortality (HR in the ≥2/d vs. the 1 egg/d group: total, 2.05 (95% CI: 1.20–3.52); cancer, 3.20 (1.51–6.76)), and that cancer mortality in the 1–2/w group was significantly less than that in the 1 egg/d group (0.68 (0.47–0.97)). Egg intake was not associated with CVD mortality. Abstract: Conclusions: Egg intake was associated with cancer and total mortality. Reducing egg intake may have some definitive health benefits in women in Japan, at least.

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Effects of a school-based stroke education program on stroke-related knowledge and behaviour modification-school class based intervention study for elementary school students and parental guardians in a Japanese rural area

Kato Suzuka, Okamura Tomonori, Kuwabara Kazuyo, Takekawa Hidehiro, Nagao Masanori, Umesawa Mitsumasa, Sugiyama Daisuke, Miyamatsu Naomi, Hino Tenyu, Wada Shinichi, Arimizu Takuro, Takebayashi Toru, Kobashi Gen, Hirata Koichi, Yokota Chiaki, Minematsu Kazuo

BMJ Open 7 ( 12 ) e017632 2017.12

Research paper (scientific journal), ISSN 2044-6055

OBJECTIVES: This study aimed to determine the effect of a stroke education programme on elementary school students and their parental guardians in a rural area in Japan that has high stroke mortality.DESIGN: School class based intervention study.SETTING: Eleven public elementary schools in Tochigi Prefecture, Japan.PARTICIPANTS: 268 students aged 11-12 years and 267 parental guardians.INTERVENTIONS: Students received lessons about stroke featuring animated cartoons and were instructed to communicate their knowledge about stroke to their parental guardians using material (comic books) distributed in the lessons. Stroke knowledge (symptoms, risk factors and attitude towards stroke) and behavioural change for risk factors were assessed at baseline, immediately after the programme and at 3 months. We also evaluated behavioural change for risk factors among parental guardians.RESULTS: The percentage of students with all correct answers for stroke symptoms, risk factors and the recommended response to stroke was significantly increased at 3 months P<0.001). We observed a significant increase in the percentage of guardians who chose all correct symptoms (P<0.001: 61.0% vs 85.4%) and risk factors (P<0.001: 41.2% vs 59.9%) at 3 months compared with baseline. The percentage of parental guardians with a high behavioural response to improving risk factors was significantly increased at 3 months compared with baseline (P<0.001).CONCLUSIONS: In a rural population with high stroke mortality, stroke education can improve knowledge about stroke in elementary school students and their parental guardians.ETHICS AND DISSEMINATION: We conducted the intervention as a part of compulsory education; this study was not a clinical trial. This study was approved by the Ethics Committee of the National Cerebral and Cardiovascular Center (M27-026).

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Detection of Subclinical Peripheral Artery Ischemia in Healthy Male Smokers by an Ankle-Brachial Index after Exercise

Kubota Yoshimi, Higashiyama Aya, Marumo Mikio, Konishi Masami, Yamashita Yoshiko, Tashiro Chikara, Okamura Tomonori, Miyamoto Yoshihiro, Wakabayashi Ichiro

Angiology 68 ( 9 ) 769 - 775 2017.10

ISSN 0003-3197

We investigated the relationship between smoking and the risk of nonnormal (≤0.99) ankle-brachial index (ABI) at rest and after ankle plantar flexion exercise in healthy male community dwellers. A cross-sectional study was performed including 228 Japanese men aged 40 to 64 years without a history of cardiovascular diseases. Participants were classified as never, ex-, and current smokers. We estimated the multivariate-adjusted odds ratios (ORs) for nonnormal ABI of ex- and current smokers in relation to never smokers after adjusting for age and other confounding factors. At rest, the prevalence of nonnormal ABI was not significantly different by smoking status. After exercise, the prevalence of nonnormal ABI increased from 1.8% to 11.5% in ex-smokers and from 3.8% to 17.0% in current smokers, while the prevalence did not significantly change in never smokers. The multivariate-adjusted OR for nonnormal ABI after ankle plantar flexion exercise, in relation to never smokers, was 3.85 (95% confidence interval [CI]: 0.79-18.9) for ex-smokers and 6.97 (95% CI: 1.32-36.7) for current smokers. Our results suggest that ABI after ankle plantar flexion exercise is useful for early detection of subclinical peripheral artery ischemia in male smokers without typical symptoms.

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