Table 2.

Association between pregnancy weight gain Z score and preeclampsia diagnosis in 15541 multiparas

BMI category	N (case)/N(total)	Odd Ratio (95%CI) of a Z Score Increase in Gestational Weight Gain
		Crude	P value	Adjusted a	P value
Total	534/15541	1.22 (1.10-1.35)	<0.001	1.28 (1.15-1.42)	<0.001
Underweight	41/994	1.06 (0.75-1.51)	0.748	0.94 (0.65-1.39)	0.760
Normal	348/12345	1.18 (1.04-1.34)	0.009	1.26 (1.11-1.43)	<0.001
Overweight or obese	145/2202	1.36 (1.13-1.65)	0.002	1.41 (1.16-1.74)	0.001

^aAdjusted for early pregnancy BMI, smoking, maternal height, maternal age, GDM, education level and mode of conception