Type 1 Diabetes Mellitus Associated or Not with Primary Hypothyroidism and Women's Fertility

The aim of this study is to evaluate the prevalence of infertility and other reproductive parameters in women with type 1 diabetes mellitus (DM1) with and without primary hypothyroidism (PH). This is a cross-sectional study conducted at Division of Endocrinology. We evaluated 110 female, aged over 18 years, 79 had DM1 and 31 had DM1 plus PH. They were interviewed to obtain data on their gynecological and obstetric history; medical charts were reviewed to determine the characteristics of the diseases and to assess clinical/laboratory data. Infertility was defined as 12 months of unprotected sexual intercourse without conception. We used the chi-square and Mann-Whitney's tests, and logistic regression analysis. The prevalence of infertility in the total sample was 24.5%, no differences were found between groups regarding obstetric outcomes and gynecologic variables. Factors associated with infertility were microvascular complication (OR: 11.36; 95% CI: 2.488-52.632;  = .029), polycystic ovary syndrome (OR: 9.80; 95% CI: 2.247-43.478;  = .016), PH (OR: 3.38; 95% CI: 1.078-10.638;  = .047), and older age at onset of DM1 (OR: 1.12; 95% CI: 1.029-1.215;  = .019). The presence of PH in women with DM1 was a predictive factor for infertility. Women with DM1 showed poorer reproductive outcomes compared to the general population.