The document discusses a study that found women with postpartum psychosis have a higher risk of autoimmune thyroid disease (AITD) and clinical thyroid dysfunction. The study examined 31 women with postpartum psychosis and found 19% had AITD initially, which was significantly higher than the 5% found in the control group of 117 women. At a 9 month follow up, 29% of the psychosis group had AITD compared to 13% of controls. Women with psychosis also showed a higher rate of developing thyroid dysfunction over time. The results suggest thyroid dysfunction may be an important factor in the development of postpartum psychosis.