Female- and Male-Specific Risk Factors for Stroke

Abstract

IMPORTANCEThe incidence of stroke is higher in men than in women. The influence of sex-specific risk factors on stroke incidence and mortality is largely unknown.OBJECTIVE To conduct a systematic review and meta-analysis of female-and male-specific risk factors for stroke.DATA SOURCES PubMed, EMBASE, and the bibliographies of articles were searched for studies published between January 1, 1985, and January 26, 2015, reporting on the association between female-and male-specific characteristics and stroke.STUDY SELECTION Observational studies reporting associations between sex-specific risk factors and stroke were selected.DATA EXTRACTION AND SYNTHESIS Two authors performed data extraction independently. Estimates were pooled with a generic variance-based, random-effects method. We followed the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) recommendations. In addition, our study adhered to the Meta-analysis of Observational Studies in Epidemiology (MOOSE) guidelines.MAIN OUTCOMES AND MEASURES Ischemic stroke, hemorrhagic stroke, any stroke, and stroke mortality. RESULTSThis systematic review and meta-analysis included 78 studies (70 longitudinal and 8 case-control) comprising 10 187 540 persons. In women, the pooled relative risks of ischemic stroke were 1.80 (95% CI, 1.49-2.18) after any hypertensive disorder in pregnancy (HDP) (gestational hypertension [GH], preeclampsia, or eclampsia) and 1.81 (95% CI, 1.44-2.27) after GH vs no HDP. The pooled relative risks of hemorrhagic stroke were 2.24 (95% CI, 1.19-4.21) in women with menopause at the age of at least 55 years vs 50 to 54 years and 5.08 (95% CI, 1.80-14.34) after GH vs no GH. The pooled relative risks of any stroke were 1.42 (95% CI, 1.34-1.50) after oophorectomy vs no oophorectomy, 0.88 (95% CI, 0.85-0.90) after hysterectomy vs no hysterectomy, 1.63 (95% CI, 1.52-1.75) after any vs no HDP, 1.54 (95% CI, 1.39-1.70) after preeclampsia or eclampsia, 1.51 (95% CI, 1.27-1.80) after GH vs no HDP, 1.62 (95% CI, 1.46-1.79) after preterm delivery, and 1.86 (95% CI, 1.15-3.02) after stillbirth vs no pregnancy complications. The pooled relative risk of stroke mortality was 1.57 (95% CI, 1.04-2.39) after GH vs no GH. In men, the pooled relative risks of ischemic stroke were 1.19 (95% CI, 1.05-1.34) after androgen deprivation therapy (ADT) vs no ADT and 1.21 (95% CI, 1.00-1.46) after orchiectomy vs no orchiectomy. The pooled relative risks of any stroke were 1.21 (95% CI, 1.06-1.37) for ADT vs no ADT and 1.35 (95% CI, 1.18-1.53) for erectile dysfunction vs no dysfunction.CONCLUSIONS AND RELEVANCE Female-specific characteristics increasing stroke risk include HDP for ischemic stroke, late menopause and gestational hypertension for hemorrhagic stroke, and oophorectomy, HDP, preterm delivery, and stillbirth for any stroke. Hysterectomy is possibly protective against any stroke. Male-specific characteristics increasing stroke risk include medical androgen deprivation therapy for ischemic and any stroke and erectile dysfunction for any stroke. C...

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