The Kuopio Osteoporosis Risk Factor and Prevention Study is a prospective population-based cohort study. In a new publication , the effect of hormone replacement therapy (HRT) on the new incidence of diabetes mellitus was examined. Almost 8500 women in the early postmenopause were followed over a 5-year period. Almost one-third of the women were current users of HRT whilst around one-quarter had previously used HRT. The diagnosis of new diabetes was ascertained from the registry of specially refunded drugs which gives the right to full reimbursement for drugs used in chronic illnesses following a physician’s diagnosis. The incidence of diabetes was slightly reduced in past users of HRT (hazard ratio (HR) 0.81; 95% confidence interval (CI) 0.57–1.16), further reduced in HRT users for < 2½ years’ duration (HR 0.53; 95% CI 0.24–1.15), and significantly reduced in HRT users for > 2½ years’ duration (HR 0.31; 95% CI 0.16–0.60). There were some baseline differences between HRT users and non-users. The HRT users were slightly younger, had lower body mass index, lower parity, lower prevalence of hypertension and greater prevalence of hysterectomy. However, the analyses were adjusted for these factors. The type and dose of HRT were not recorded, although this population is thought to reflect the use of oral 17β-estradiol, with or without a progestogen.
National Heart & Lung Institute, Imperial College London, Royal Brompton Hospital, London, UK
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