Table 4.

Association of Pre-Pregnancy BMI with GDM Risk Based on Different Pre-Pregnancy Hemoglobin Levels

Variables		GDM/Total (%)	Model 1†			Model 2‡
			OR	95% CI	P	OR	95% CI	P
Pre-pregnancy hemoglobin level (g/L)<123	Pre-pregnancy BMI (kg/m2)
	<18.5	5/102(4.9)			Reference		Reference
	18.5–24.9	41/411(9.9)	2.15	0.83–5.58	0.116	2.13	0.82–5.55	0.123
	25.0–29.9	14/46(30.4)	8.49	2.84–25.41	<0.001	9.28	3.01–28.6	<0.001
	≥30	1/10(10)	2.16	0.23–20.51	0.504	2.09	0.21–20.65	0.530
Pre-pregnancy hemoglobin level (g/L)≥123	Pre-pregnancy BMI (kg/m2)
	<18.5	6/78(7.7)			Reference		Reference
	18.5–24.9	79/533(14.8)	2.09	0.88–4.95	0.960	2.04	0.84–4.99	0.117
	25.0–29.9	33/91(36.3)	6.83	2.68–17.41	<0.001	7.06	2.66–18.61	<0.001
	≥30	8/180(44)	9.60	2.76–33.45	<0.001	10.77	2.85–40.63	<0.001

Notes: ^†Univariate model. ^‡Adjusted for age, pre-pregnancy systolic blood pressure, pre-pregnancy diastolic blood pressure, smoking exposure, family history of diabetes, alcohol consumption.