Objectives: Studies regarding the effects of parity on blood pressure in later life produced conflicting results. The aim of our study is to analyse whether parity influences the prevalence of hypertension in perimenopausal and postmenopausal women.
Methods: One thousand perimenopausal and postmenopausal women (mean age 55.2 ± 5.4 years) were enrolled with a median follow-up of 63.0 months. The study sample consisted of patients who self-referred, in 1998–2009, to the BenEssere Donna Clinic, dedicated to menopause-related disorders.
Results: One hundred and twenty-two (12.2%) women were nulliparous and 878 (87.8%) had at least one child. Thirty-four (27.9%) women among nulliparous and 326 (37.1%) among parous were hypertensive at baseline (P = 0.046) and 812 women (81.2%) were in their postmenopausal period. Univariate analysis showed that women with one or more children were at higher risk of being hypertensive [odds ratio (OR): 1.529; 95% confidence interval (CI): 1.006–2.324; P = 0.047]. Likewise, multivariate analysis revealed that parity (OR: 2.907; 95% CI: 1.290–6.547; P = 0.010), BMI (OR: 1.097; 95% CI: 1.048–1.149; P < 0.001) and family history of hypertension (OR: 3.623; 95% CI: 2.231–5.883; P < 0.001) were independently related to hypertension at baseline. In a subanalysis of 640 initially normotensive women, 109 (17.0%) patients developed hypertension after follow-up, without a statistically significant association with parity (13.6% in nulliparous versus 17.6% in parous; P = 0.362). Consistently, parity showed no relationship with the incidence of hypertension during follow-up (OR: 1.350; 95% CI: 0.707–2.579; P = 0.363).
Conclusion: For the first time in a population of White perimenopausal and postmenopausal women, parity was demonstrated to be independently associated with early hypertension during menopausal transition. Conversely, postmenopausal hypertension was not related with parity.
Department of Cardiology, University of Modena and Reggio Emilia, Modena, Italy
Correspondence to Luca Bertelli, Division of Cardiology, Modena University Hospital, Via del Pozzo 71 - 41124 Modena, Italy Tel: +39 059 422 4523; fax: +39 059 422 3714; e-mail: email@example.com
Abbreviations: CI, confidence interval; CVD, cardiovascular disease; DXA, dual-emission X-ray absorptiometry; HDL, high density lipoprotein; HRT, hormonal replacement therapy; LDL, low density lipoprotein; NO, nitric oxide; OR, odds ratio
Received 29 March, 2012
Revised 6 August, 2012
Accepted 30 October, 2012
Previously presented at Euro PRevent 2012 in Dublin.