. Author manuscript; available in PMC: 2015 Mar 11.

Published in final edited form as: Paediatr Perinat Epidemiol. 2014 Sep;28(5):412–423. doi: 10.1111/ppe.12142

Table 4. Hazard ratios for the association of body size with early (<8 gestational weeks) and late SAB.

	Early SAB <8 weeks gestation					Late SAB >8 weeks

	NSAB^a	Total GW^a	Unadjusted	Adjusted model HR [95% CI]^b	Adjusted model with body size HR [95% CI]^c	NSAB^a	Total GW^a	Unadjusted	Adjusted model HR [95% CI]^b	Adjusted model with body size HR [95% CI]^c
Body mass index (kg/m²)
<20	67	414	0.95	0.95 [0.70,1.28]	0.92 [0.67,1.26]	41	14 578	1.06	1.10 [0.72,1.68]	0.95 [0.58,1.58]
20–24.9	255	1685		1.00 [Reference]		130	51 274		1.00 [Reference]
25–29.9	78	494	0.84	0.82 [0.62,1.10]	0.87 [0.58,1.29]	57	20 200	1.02	1.04 [0.70,1.54]	1.07 [0.69,1.67]
≥30	80	502	1.36	1.34 [1.01,1.77]	1.41 [0.84, 2.35]	24	11 132	0.95	0.99 [0.62,1.59]	0.99 [0.56,1.74]
Waist circumference
<75 cm	121	758		1.00 [Reference]		78	24 742		1.00 [Reference]
75–79 cm	114	754	1.04	1.03 [0.78,1.38]	1.02 [0.77,1.35]	51	22 366	0.78	0.74 [0.47,1.16]	0.73 [0.44,1.19]
80–86 cm	97	679	0.88	0.87 [0.66,1.14]	0.86 [0.63,1.18]	53	22 436	0.78	0.74 [0.49,1.10]	0.71 [0.43,1.17]
≥87cm	148	904	1.08	1.04 [0.79,1.38]	0.91 [0.54,1.53]	70	27 640	0.87	0.85 [0.55,1.30]	0.81 [0.44,1.50]
Waist-to-hip ratio
<0.75	115	688		1.00 [Reference]		71	20 336		1.00 [Reference]
0.75–0.79	116	812	0.93	0.92 [0.68,1.25]	0.92 [0.67,1.25]	59	23 504	0.75	0.72 [0.47,1.10]	0.72 [0.47,1.10]
0.80–0.84	110	693	0.80	0.78 [0.54,1.11]	0.76 [0.53,1.10]	56	24 002	0.78	0.73 [0.48,1.11]	0.73 [0.48,1.11]
≥0.85	139	902	0.92	0.89 [0.66,1.19]	0.84 [0.62,1.16]	66	29 342	0.72	0.69 [0.46,1.02]	0.68 [0.45,1.02]
Height
<166 cm	163	1081		1.00 [Reference]		70	30 469		1.00 [Reference]
166−169 cm	112	709	1.00	1.01 [0.77,1.31]	1.00 [0.73,1.31]	68	20 442	1.49	1.45 [0.99, 2.12]	1.41 [0.96, 2.08]
170−173 cm	107	666	0.89	0.89 [0.69,1.15]	0.87 [0.67,1.14]	64	22 392	1.28	1.23 [0.85,1.79]	1.18 [0.81,1.73]
≥174 cm	98	639	0.78	0.78 [0.60,1.02]	0.77 [0.58,1.02]	50	23 881	0.92	0.88 [0.59,1.33]	0.83 [0.54,1.28]
Location of weight gain
Equally all over	125	810		1.00 [Reference]		73	26 654		1.00 [Reference]
Waist/stomach	191	1259	1.02	1.02 [0.81, 1.28	1.04 [0.83,1.32]	109	39 716	0.99	0.99 [0.73,1.35]	0.99 [0.73,1.35]
Hips/thighs	142	882	1.13	1.14 [0.87,1.50]	1.17 [0.88,1.54]	56	25 872	0.84	0.84 [0.56,1.25]	0.83 [0.55,1.26]
Does not gain weight	16	107	0.83	0.82 [0.45,1.50]	0.84 [0.45,1.57]	11	4097	0.95	0.98 [0.45, 2.16]	0.95 [0.42, 2.13]
Chest/shoulders	6	37	1.10	1.06 [0.34, 3.31]	1.07 [0.35, 3.31]	3	845	1.29	1.29 [0.39, 4.19]	1.27 [0.39, 4.17]

Frequencies and gestational weeks (GW) from the first imputation dataset.

Adjusted for maternal age, physical activity, caffeine consumption, parity, vocational training, alcohol consumption, and smoking.

Adjusted for variables in footnote b and body size (BMI model adjusted for waist circumference, height model adjusted for weight; all other models adjusted for BMI).