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The association between oral contraceptive use, bone mineral density and fractures in women aged 50���80 years

      Abstract

      Background

      The associations between oral contraceptive (OC) use, bone mineral density (BMD) and the risk of fractures remain controversial.

      Study Design

      A cross-sectional study of 491 women aged 50���80 years was performed. We assessed OC use and fractures by questionnaire, and BMD and vertebral deformity by dual-energy x-ray absorptiometry.

      Results

      Ever use of OC was associated with significantly higher BMD at the total body (6%, p<.001) and spine (4%; p=.05) (but not hip) after adjustment for confounders. There was also a significant association between duration of OC use and total body and spine BMD. Use of OCs for 5���10 years was associated with reduced vertebral deformity (adjusted odds ratio 0.46, 95% confidence interval 0.22���0.94).

      Conclusions

      Oral contraceptive use and duration were associated with higher total body and spine BMD and a consistent reduction in vertebral deformities, although most associations did not reach significance.

      Keywords

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