Table 2.

Comparisons of maternal pre-pregnancy BMI and GWG between the case and control groups

	Control	Case	Value	df	p
	(n = 2200)	(n = 697)
1. BMI (kg/m2), mean (SD)	20.30 (2.27)	20.50 (2.25)	−2.015	2895	0.044
2. BMI categories, n (%)
Underweight	466 (21.2%)	122 (17.5%)	4.841	3	0.184
Normal	1580 (71.8%)	523 (75.0%)
Overweight	141 (6.4%)	49 (7.0%)
Obese	13 (0.6%)	3 (0.5%)
3. GWG (kg), mean (SD)	15.04(5.81)	15.70 (6.21)	−2.526	2895	0.012
4. GWG categories, n (%)
Inadequate	793 (36.0%)	226 (32.4%)	7.912	2	0.019
Adequate	344 (15.6%)	139 (19.9%)
Excessive	1063 (48.4%)	332 (47.7%)

BMI body mass index, GWG gestation weight gain