OBJECTIVE: To examine associations of gravidity and parity with all-cause, cardiovascular disease (CVD), and coronary heart disease (CHD) mortality in postmenopausal women. DESIGN: Prospective cohort study. SETTING: Rancho Bernardo, a southern California community. PATIENT(S): One thousand two hundred ninety-four postmenopausal women ages 50-96 who attended a 1984-87 research clinic visit at which reproductive and medical histories were obtained and who were followed through 2007. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): All-cause, CVD, CHD, and non-CHD CVD mortality, determined by nosologist-coded death certificates. RESULT(S): Average baseline age was 70.6 ± 9.2. Numbers of pregnancies ranged from 0 to 13 (median = 2); births ranged from 0 to 11 (median = 2). During a median of 19.3 years of follow-up, 707 women (54.6%) died, with 46.5% attributed to CVD, 20.5% to CHD, and 26.0% to non-CHD CVD. Trend analyses showed inverse associations of gravidity with CVD mortality and non-CHD CVD mortality. Women with four or more pregnancies were less likely than nulligravidas to have fatal CVD (hazard ratio [HR] = 0.63, 95% confidence interval [CI] = 0.40-0.99) and non-CHD CVD (HR = 0.48, 95% CI = 0.26-0.91) independent of age, years postmenopause, obesity, and HDL. Associations increased after the first decade of follow-up. Parity and gravidity were not associated with overall or CHD mortality. CONCLUSION(S): High gravidity was associated with reduced CVD and non-CHD CVD mortality in postmenopausal women. Protective associations could reflect biological mechanisms that occur with repeated pregnancy or greater social support related to family size among multiparous women.
OBJECTIVE: To examine associations of gravidity and parity with all-cause, cardiovascular disease (CVD), and coronary heart disease (CHD) mortality in postmenopausal women. DESIGN: Prospective cohort study. SETTING: Rancho Bernardo, a southern California community. PATIENT(S): One thousand two hundred ninety-four postmenopausal women ages 50-96 who attended a 1984-87 research clinic visit at which reproductive and medical histories were obtained and who were followed through 2007. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): All-cause, CVD, CHD, and non-CHD CVD mortality, determined by nosologist-coded death certificates. RESULT(S): Average baseline age was 70.6 ± 9.2. Numbers of pregnancies ranged from 0 to 13 (median = 2); births ranged from 0 to 11 (median = 2). During a median of 19.3 years of follow-up, 707 women (54.6%) died, with 46.5% attributed to CVD, 20.5% to CHD, and 26.0% to non-CHD CVD. Trend analyses showed inverse associations of gravidity with CVD mortality and non-CHD CVD mortality. Women with four or more pregnancies were less likely than nulligravidas to have fatal CVD (hazard ratio [HR] = 0.63, 95% confidence interval [CI] = 0.40-0.99) and non-CHD CVD (HR = 0.48, 95% CI = 0.26-0.91) independent of age, years postmenopause, obesity, and HDL. Associations increased after the first decade of follow-up. Parity and gravidity were not associated with overall or CHD mortality. CONCLUSION(S): High gravidity was associated with reduced CVD and non-CHD CVD mortality in postmenopausal women. Protective associations could reflect biological mechanisms that occur with repeated pregnancy or greater social support related to family size among multiparous women.
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