Table 3.

Perinatal, Infant Death, and Small-for-Gestational-Age in Singletons Born of Untreated Couples According to Time to Pregnancy

		Perinatal deaths				Infant deaths (8–365 days)				Small-for-gestational-age*
	No. of singletons	No. (mortality, 1/1000)	Crude OR (95% CI)	Adjusted OR† (95% CI)	Adjusted OR‡ (95% CI)	No. (mortality, 1/1000)	Crude OR (95% CI)	Adjusted OR† (95% CI)	Adjusted OR‡ (95% CI)	No. (%)	Crude OR (95% CI)	Adjusted OR§ (95% CI)	Adjusted OR|| (95% CI)
Time to pregnancy (months)
0–2	28,110	132 (4.7)	1.00 Ref	1.00 Ref	1.00 Ref	42 (1.5)	1.00 Ref	1.00 Ref	1.00 Ref	1169 (4.2)	1.00 Ref	1.00 Ref	1.00 Ref
3–5	13,138	74 (5.6)	1.20 (0.90–1.60)	1.18 (0.88–1.57)	1.15 (0.87–1.54)	18 (1.4)	0.92 (0.53–1.59)	0.91 (0.53–1.59)	0.94 (0.54–1.64)	572 (4.4)	1.05 (0.95–1.16)	1.04 (0.94–1.15)	1.00 (0.90–1.10)
6–12	9,793	47 (4.8)	1.02 (0.73–1.43)	0.98 (0.70–1.37)	0.95 (0.68–1.33)	17 (1.7)	1.16 (0.66–2.04)	1.16 (0.66–2.04)	1.22 (0.69–2.14)	459 (4.7)	1.13 (1.01–1.27)	1.10 (0.98–1.23)	1.03 (0.92–1.15)
>12	5,787	42 (7.3)	1.55 (1.09–2.20)	1.39 (0.97–1.97)	1.32 (0.93–1.88)	9 (1.6)	1.04 (0.51–2.15)	1.09 (0.53–2.26)	1.18 (0.57–2.44)	345 (6.0)	1.47 (1.30–1.66)	1.38 (1.22–1.56)	1.25 (1.10–1.42)
P for trend			0.054	0.19	0.30		0.73	0.67	0.51		<0.001	<0.001	0.005

Logistic regression; OR: odd ratios; CI: confidence interval.

^*Among live births.

^†Adjusted for maternal age, and pre-pregnancy body mass index.

^‡Adjusted for maternal age, pre-pregnancy body mass index, and parity.

^§Adjusted for maternal age, and smoking.

^||Adjusted for maternal age, smoking, and parity.