TPO and polycystic ovary syndrome: A recent meta-analysis of 40 observational studies found a significantly higher prevalence of thyroid autoantibodies in PCOS: anti-TPO OR = 2.03 (95% CI, 1.35–3.04; p = 0.0006) and anti-TG OR = 1.92 (95% CI, 1.23–3.01; p = 0.004) [44].