Body mass index and risks of incident ischemic stroke subtypes: The Japan public health center-based prospective (JPHC) study

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Abstract

Background: The association of body mass index (BMI) with risks of ischemic stroke subtypes have not been established. Methods: Cumulative average BMI was calculated using self-reported body weight and height obtained from baseline (Cohort I in 1990, and Cohort II from 1993-1994) and 5- and 10-year questionnaire surveys of Japan Public Health Center-based prospective (JPHC) study. A total of 42,343 men and 46,413 women aged 40-69 years were followed-up for the incidence of lacunar, large-artery occlusive, and cardioembolic strokes. A sub-distribution hazard model was used to estimate subdistribution hazard ratios (SHRs) and the 95% confidence intervals (CIs). Results: During a median of 20.0 years of follow-up, we documented 809 and 481 lacunar, 395 and 218 large-artery occlusive, and 568 and 298 cardioembolic strokes in men and women, respectively. After adjustment for baseline age, updated smoking, alcohol consumption, leisure-time physical activity, and histories of hypertension, dyslipidemia, and diabetes mellitus, cumulative average BMI was positively linearly associated with lacunar (trend P = 0.007), large-artery occlusive (trend P = 0.002), and cardioembolic (trend P < 0.001) strokes in men, and with lacunar (trend P < 0.001) and large-artery occlusive (trend P = 0.003) strokes in women. There were approximately two-fold excess risk of cardioembolic stroke in both sexes and of lacunar and large-artery occlusive strokes in women for cumulative average BMI ≥30 kg=m2 compared to BMI 23-<25 kg=m2. Conclusion: Cumulative average BMI showed a positive linear effect on sub-distribution hazards of lacunar, large-artery occlusive, and cardioembolic strokes in both sexes, except for cardioembolic stroke in women.

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APA

Li, Y., Yatsuya, H., Iso, H., Yamagishi, K., Saito, I., Kokubo, Y., … Tsugane, S. (2019). Body mass index and risks of incident ischemic stroke subtypes: The Japan public health center-based prospective (JPHC) study. Journal of Epidemiology, 29(9), 325–333. https://doi.org/10.2188/jea.JE20170298

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