Vitamin D Levels in Women with Polycystic Ovary Syndrome: A Population-Based Study Abstract: Background: Conflicting evidence supports a role for vitaminDin women with reproductive disorders such as polycystic ovary syndrome (PCOS) but studies on large, unselected populations have been lacking. Methods: We conducted a general population-based study from the prospective Northern Finland Birth Cohort 1966 (NFBC1966). Serum 25-hydroksyvitamin D...