Association of cesarean section and preterm birth with weekly gestational weight gain in the 2^nd and 3^rd trimesters and total weight gain (according to Institute of Medicine, 2009, categories). Brazilian Study of Gestational Diabetes (EBDG).

†

Differences from 2,244 due to lack of data on the specific outcomes.

‡

Significant relative risk.

*

Cesarean section: Model 2 (2^nd trimester) = Model 1+ pre-pregnancy BMI, age, education, parity, hypertensive disorders, height and birth weight. Skin color and 3^rd trimester weekly weight gain were removed from the model 2 due to lack of statistical significance. Model 2 (3^rd trimester) = Model 1+ pre-pregnancy BMI, age, education, parity, hypertensive disorders, diabetes, height, birth weight, alcohol consumption, gestational age at delivery and 2^nd trimester gestational weight gain. Skin color and smoking were removed from the model 2 due to lack of statistical significance. Model 2 (total weight gain) = Model 1+ pre-pregnancy BMI, age, education, parity, hypertensive disorders height and birth weight. Skin color, alcohol consumption, diabetes, smoking and gestational age at delivery were removed from the model 2 due to lack of statistical significance.

**

Preterm birth: Model 2 (2^nd trimester) = Model 1+ pre-pregnancy BMI, education, hypertensive disorders, diabetes, 3^rd trimester gestational weight gain and birth weight. Age, height and parity were removed from the model 2 due to lack of statistical significance. Model 2 (3^rd trimester) = Model 1+ pre-pregnancy BMI, education, diabetes, birth weight and 2^ndtrimester gestational weight gain. Hypertensive disorders was removed due to lack of statistical significance.

Model 2 (total weight gain) = Model 1+ pre-pregnancy BMI, diabetes, hypertensive disorders, birth weight. Education was removed due to lack of statistical significance.

RR = risk relative; Reference category = Adequate weight gain.