Gestational diabetes mellitus - Neonatal and maternal outcomes in women treated with insulin or diet: A propensity matched analysis

Pregnant women worldwide face the risk of developing gestational diabetes mellitus (GDM), if left untreated, can cause complications. The study explores factors influencing the choice between diet control and insulin therapy for pregnant women with GDM. It aims to understand how these choices impact maternal and neonatal outcomes. In this quasi-experimental study, clinicians determined treatment (diet control or insulin) for 1030 individuals with GDM at a private practice from 2010 to 2020 based on baseline characteristics. Propensity scores (PS), reflecting the probability of treatment allocation, were derived through multiple logistic regression. After PS matching, 386 individuals were paired from two study groups. The insulin-treated group exhibited a 4.43 times higher risk of neonatal hypoglycemia than the diet group. Insulin-treated individuals, stratified by PS, revealed that the high-risk quartile had significantly higher mean insulin requirements and a doubled dose at full term compared to the lower-risk quartiles. The mean insulin dose did not significantly differ in the first three quartiles, but the last quartile showed a significant increase (p = 0.008), particularly for individuals with PS exceeding 0.70, indicating a higher insulin dose requirement for effective glucose control. This study reveals that individuals with a bad obstetrics history, a family history of diabetes, obesity, and elevated baseline glycemic parameters necessitate higher insulin doses. This insight improves clinicians' decision-making in diagnosis and treatment planning, enhancing the precision of medical practices.