Table 1.

Summary of baseline characteristics of participant data used to develop, validate, and test the pre-pregnancy weight models is reported. The pre-pregnancy BMI was computed from self-reported pre-pregnancy weight. A description of how each study and reference database was used is included. Summary data is reported as mean ± SD.

Study	BMI (kg/m2)	Height (cm)	Gestational day	Age (y)	Applied Variables	Application
Project Viva N=301(9)	24.0±5.4	165.3±7.0	53.1±20.6	31.6±5.8	1. Measured pre-pregnancy weights. 2. Demographic variables. 3. First trimester measured weight.	Model development.
FFD N=401 (10)	26.4 ± 5.7	162.5 ±6.6	94.8±12.6	28.7±5.2	1. Measured pre-pregnancy weights (N=51). 2. Self-reported pre-pregnancy weights (N=401) 3. Second trimester measured weights (N=196)	1. Measured pre-pregnancy weights were used to test model. 2. Self-reported pre-pregnancy weight were used to compare to model predictions. 3. Second trimester weight was used as the model input for the first clinical visit weight. Resulting model predictions were compared to self-reported pre-pregnancy weight.
PROGRESS N=1054 (12, 13)	26.1 ± 5.5	155.1±5.5	131.1±6.5	27.7±5.5	1. Self-reported pre-pregnancy weights. 2. First/second trimester measured weights.	Self-reported pre-pregnancy weight were used to compare to model predictions.