Association among pre-pregnancy body mass index, gestational weight gain and neonatal birth weight: a prospective cohort study in China

Table 4 Adjusted OR for birth weight classified by jointed pre-pregnancy BMI and GWG_rate

Pre-BMI/GWG_rate	N(%)	SGA		LGA
Pre-BMI/GWG_rate	N(%)	OR ^a	95%CI	OR ^a	95%CI
Underweight
Insufficient	205 (5.72)	1.760	0.799–3.874	1.860	0.556–6.220
adequate	128 (3.57)	Ref.		Ref.
Excessive	175 (4.88)	0.910	0.370–2.239	3.305	0.990–11.038
Normal weight
Insufficient	698 (19.47)	1.514	0.922–2.311	0.962	0.648–1.430
adequate	683 (19.05)	Ref.		Ref.
Excessive	1173 (32.72)	0.650 ^b	0.387–0.945	1.606 ^b	1.155–2.233
Overweight/Obesity
Insufficient	60 (1.67)	0.805	0.135–4.811	0.190^b	0.042–0.853
adequate	128 (3.57)	Ref.		Ref.
Excessive	335 (9.35)	0.515	0.146–1.809	1.698 ^b	1.062–2.996

^a Adjusted for maternal age, occupation, gravidity, parity, GDM and gestational hypertension; ^b P < 0.05

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