In a three-pronged study, UK investigators tested the hypothesis that polycystic ovary syndrome (PCOS) is linked with autism because both conditions are associated with elevated prenatal testosterone levels.
In Study 1, the authors found that a significantly higher percentage of women with autism were diagnosed with PCOS than the controls (2.3% vs 1.1%; unadjusted OR: 2.01, 95% CI 1.22-3.30). In Study 2, autism was almost two times more prevalent in PCOS cases than in controls (0.10% vs 0.05%; unadjusted OR: 2.01, 95% CI 1.26-3.20). In Study 3, mothers with PCOS had higher odds of having a child with autism than the controls (unadjusted OR: 1.60, 95% CI 1.28-2.00).
Read more here.