Modification effect of maternal preconception BMI on the association between preconception hypoglycemia and adverse pregnancy outcomes.

Underweight, BMI < 18.5 kg/m 2 ; Normal weight, BMI between 18.5 and 23.9 kg/m 2 ; Overweight, BMI between 24.0 and 27.9 kg/m 2 ; Obesity, BMI ≥ 28.0 kg/m 2 . Model was adjusted for maternal age, ethnicity, educational level, occupation, region, smoking, passive smoking, alcohol consumption, parity, preconception medicine use, folic acid use, hypertension, diabetes, anemia, thyroid disorder, liver disorder, and infection. Abbreviations: IPTW, inverse probability treatment weighting; FPG, fasting plasma glucose; RERI, relative excess risk due to interaction; OR, odds ratio; CI, confidence interval; BMI, body mass index. (DOCX)