Table 2. Odds ratio for PIH and GDM associated with categories of birth weight based on the partially imputed dataset (covariates imputed except for birthweight, N = 46,365).

	Birth weight
	<1,500 g (n = 365)	1,500–2,499 g (n = 5,088)	2,500–2,999 g (n = 26,099)	3,000–3,999 g (n = 14,498)	>4,000 g (n = 315)
	OR [95% CI]
PIH
n (%)	46 (12.6)	480 (9.4)	2,346 (9.0)	1,143 (7.9)	33 (10.5)
Model 1a	1.60 [1.16;2.19]	1.16 [1.03;1.30]	1.11 [1.03;1.20]	reference	1.41 [0.98;2.04]
Model 2b	1.58 [1.15;2.17]	1.13 [1.01;1.27]	1.10 [1.02;1.19]	reference	1.43 [0.99;2.07]
Model 3ac	1.57 [1.14;2.15]	1.13 [1.00;1.26]	1.10 [1.02;1.19]	reference	1.43 [0.99;2.07]
Model 3bd	1.60 [1.17;2.21]	1.16 [1.03;1.30]	1.13 [1.04;1.22]	reference	1.41 [0.97;2.04]
GDM
n (%)	10 (2.7)	211 (4.1)	945 (3.6)	678 (4.7)	23 (7.3)
Model 1a	0.79 [0.42;1.50]	1.18 [1.00;1.38]	1.00 [0.90;1.11]	reference	1.34 [0.87;2.07]
Model 2b	0.80 [0.42;1.51]	1.18 [1.00;1.39]	1.01 [0.91;1.13]	reference	1.28 [0.83;1.98]
Model 3ac	0.79 [0.41;1.49]	1.18 [1.00;1.39]	1.03 [0.92;1.14]	reference	1.26 [0.81;1.95]
Model 3bd	0.80 [0.42;1.52]	1.20 [1.02;1.42]	1.04 [0.94;1.16]	reference	1.24 [0.80;1.93]

CI, confidence interval; GDM, gestational diabetes mellitus; OR, odds ratio; PIH, pregnancy-induced hypertension.

^amodel 1: adjusted for birth year.

^bmodel 2: model 1 + (education) + (family history) + (passive smoking at 10 years old) + (height) + (older sibling).

^cmodel 3a: model 2 + (age at first pregnancy) + (age at first pregnancy) × (birth year) + (smoking status).

^dmodel 3b: model 3a + (BMI at 20 years old).