Table 2.

Association between pregnancy weight gain z-score before pre-eclampsia diagnosis in 62,705 nulliparous women in Stockholm-Gotland, 2008-2013.

Pre-eclampsia status	BMI-category	N case/N total	Odd Ratios (95 % CI) of a z-score increase in gestational weight gain
			Crude	Adjusted*
Pre-eclampsia, any	Normal	1,617/44,514	1.61 (1.53-1.70)	1.64 (1.55-1.73)
	Overweight	683/11,788	1.52 (1.39-1.66)	1.59 (1.45-1.74)
	Obese	414/4,216	1.13 (1.01-1.26)	1.19 (1.06-1.33)
Early onset pre-eclampsia, <34 weeks	Normal	196/44,514	1.35 (1.16-1.56)	1.43 (1.23-1.67)
	Overweight	71/11,788	1.11 (0.86-1.44)	1.21 (0.92-1.58)
	Obese	57/4,216	0.87 (0.67-1.14)	0.97 (0.74-1.27)
Late preterm onset pre-eclampsia, 34-36 weeks	Normal	310/43,934	1.67 (1.49-1.88)	1.70 (1.51-1.92)
	Overweight	125/11,592	1.50 (1.22-1.83)	1.58 (1.28-1.94)
	Obese	70/4,112	0.88 (0.69-1.12)	0.90 (0.71-1.16)
Term onset pre-eclampsia, ≥37 weeks	Normal	1,111/42,321	1.62 (1.52-1.73)	1.64 (1.53-1.75)
	Overweight	487/11,122	1.59 (1.43-1.77)	1.65 (1.48-1.84)
	Obese	287/3,917	1.24 (1.09-1.42)	1.30 (1.14-1.50)

^*Adjusted for maternal age, height, smoking, cohabiting with partner, pre-pregnancy diabetes and earl-pregnancy BMI.