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Does sex matter in the associations between classic risk factors and fatal coronary heart disease in populations from the Asia-Pacific region?

journal contribution
posted on 28.11.2005, 00:00 authored by Asia Pacific Cohort Studies Collaboration, Rachel HuxleyRachel Huxley, Mark Woodward, Federica Barzi, Jean Woo Wong, Wen Harn Pan, Anushka Patel, A Okayama, H Ueshima, H Maegawa, N Aoki, M Nakamura, N Kubo, T Yamada, Z S Wu, C H Yao, G Andrews, T A Welborn, Z Tang, L S Liu, J X Xie, R Norton
Background: There is much interest in promoting healthy heart awareness among women. However, little is known about the reasons behind the lower rates of heart disease among women compared with men, and why this risk difference diminishes with age. Previous comparative studies have generally had insufficient numbers of women to quantify such differences reliably.
Methods: We carried out an individual participant data meta-analysis of 39 cohort studies (32 from Asian countries and 7 from Australia and New Zealand). Cox models were used to estimate hazard ratios (HR) for coronary death, comparing men to women. Further adjustments were made for several proven coronary risk factors to quantify their contributions to the sex differential. Sex interactions were tested for the same risk factors.
Results: During 4 million person-years of follow-up, there were 1989 (926 female) deaths from coronary heart disease (CHD). The age-adjusted and study-adjusted male/female HR (95% confidence interval [95% CI]) was 2.05 (1.89-2.22). At baseline, 54% of men vs. 7% of women were current smokers; hence, adjustment for smoking explained the largest component (20%) of this HR. A significant sex interaction was observed between systolic blood pressure (SBP) and CHD mortality such that a 10 mm Hg increase was associated with a 15% greater increase in the relative risk (RR) of coronary death in women compared with men (p = 0.002).
Conclusions: Only a small amount of the sex differential in coronary death could be explained by differences in the prevalence of classic risk factors. Alternative explanations are required to explain the age-related attenuation of the sex difference in CHD risk.

History

Journal

Journal of Women's Health

Volume

14

Issue

9

Pagination

820 - 828

Publisher

Mary Ann Liebert, Inc. Publishers

Location

New Rochelle, N.Y.

ISSN

1540-9996

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2005, Mary Ann Liebert, Inc.