TABLE 3.

	BMI group	Proportion (% )	Unadjusted p	OR	95% CI
Pre-term delivery	25	5.8
	26 to 29	6.5	0.07	1.02	0.87 to 1.20
	30 to 70	7.9	<0.001	1.12	0.92 to 1.36
	26 to 70	7.0	<0.001	1.06	0.93 to 1.21
Abnormal FHR pattern	25	17.1
	26 to 29	18.5	0.07	1.13	1.02 to 1.25
	30 to 70	19.0	0.06	1.18	1.03 to 1.35
	26 to 70	18.6	0.01	1.15	1.05 to 1.25
Umbilical vein pH < 7.15 at birth	25	1.1
	26 to 29	1.5	0.12	1.36	0.97 to 1.90
	30 to 70	1.6	0.13	1.47	0.96 to 2.24
	26 to 70	1.5	0.04	1.38	1.04 to 1.83
5 minutes Apgar < 7	25	1.5
	26 to 29	2.5	<0.001	1.54	1.20 to 1.98
	30 to 70	2.6	<0.001	1.64	1.22 to 2.28
	26 to 70	2.5	<0.001	1.59	1.28 to 1.97
Instrumental delivery	25	5.9
	26 to 29	5.2	0.11	0.98	0.83 to 1.16
	30 to 70	4.7	0.04	0.96	0.76 to 1.21
	26 to 70	5.1	0.01	0.98	0.85 to 1.13
Cesarean section	25	15.2
	26 to 29	19.4	<0.001	1.22	1.10 to 1.35
	30 to 70	24.6	<0.001	1.68	1.48 to 1.91
	26 to 70	21.2	<0.001	1.37	1.25 to 1.49
SGA (<10th percentile)	25	10.2
	26 to 29	7.1	<0.001	0.67	0.58 to 0.77
	30 to 70	8.0	0.003	0.75	0.63 to 0.90
	26 to 70	7.4	<0.001	0.69	0.62 to 0.78
Low birth weight (<2500 g)	25	4.3
	26 to 29	5.2	0.002	1.04	0.89 to 1.21
	30 to 70	4.7	0.20	0.99	0.82 to 1.19
	26 to 70	6.2	<0.001	1.13	0.90 to 1.41
Admission to neonatal unit	25	7.5
	26 to 29	9.7	<0.001	1.20	1.06 to 1.37
	30 to 70	12.0	<0.001	1.38	1.17 to 1.61
	26 to 70	10.5	<0.001	1.26	1.13 to 1.41
Fetal death	25	0.3
	26 to 29	0.5	0.06	1.54	0.88 to 2.68
	30 to 70	0.7	0.006	2.35	1.28 to 4.32
	26 to 70	0.6	0.004	1.79	1.14 to 2.83
Perinatal death	25	0.5
	26 to 29	0.7	<0.04	1.54	0.98 to 2.42
	30 to 70	1.1	<0.001	2.19	1.33 to 3.62
	26 to 70	0.9	<0.001	1.74	1.20 to 2.52

 BMI = 25 kg/m², n = 20,333; BMI = pooled, 26 to 70 kg/m², n = 5268; BMI = overweight, 26 to 29 kg/m², n = 3388; BMI = obese, 30 to 70 kg/m², n = 1880.

 OR, odds ratio; CI, confidence index; FHR, fetal heart rate; SGA, small for gestational age.