Preovulation body mass index and pregnancy after first frozen embryo transfer in patients with polycystic ovary syndrome and insulin resistance

Objective To examine the association between preovulation body mass index and pregnancy outcomes after frozen embryo transfer in patients with polycystic ovary syndrome with insulin resistance. Design This was a single-center, retrospective cohort study. Patient(s) Women with infertility, diagnosed with polycystic ovary syndrome and insulin resistance, and treated at the Reproductive Medicine Center, Second People's Hospital of Nanning, China, between January 2020 and August 2023, were included. Exposure Patients were divided into four groups according to their body mass index (BMI): slim (<18.5 kg/m(2)), normal (18.5 <= BMI <24 kg/m(2)), overweight (24 <= BMI <28 kg/m(2)), or obese (>= 28 kg/m(2)). Main Outcome Measure(s) The main pregnancy outcomes included rates of embryo implantation, biochemical pregnancy, clinical pregnancy, and ongoing pregnancy. Result(s) In total, 282 eligible patients were included. A linear association was observed between the BMI and clinical pregnancy outcomes of the first frozen embryo transfer. After accounting for all potential variables, each 1 kg/m(2) increase in BMI was linked to a 2% decrease in the embryo implantation rate, 11% decrease in the frequency of biochemical pregnancy, and 9% decrease in the both clinical and ongoing pregnancy rates. Conclusion(s) In patients with polycystic ovary syndrome and insulin resistance, a higher BMI was associated with lower rates of embryo implantation, biochemical pregnancy, clinical pregnancy, and ongoing pregnancy.