Table 1.

Neonatal deaths (per 1000 births) as a function of time to pregnancy and treatment and crude and adjusted logistic regressions

Time to pregnancy or treatment	Deaths/births (per 1000)	Crude odds ratio (95% CI)	Adjusted odds ratio*(95% CI)
<3 months	13/8361 (1.55)	1.00	1.00
3-12 months	22/7944 (2.77)	1.78 (0.90 to 3.54)	1.76 (0.89 to 3.50)
>12 months	18/4142 (4.35)	2.80 (1.37 to 5.73)	2.82 (1.35 to 5.90)
No treatment reported	11/2104 (5.23)	3.38 (1.51 to 7.54)	3.32 (1.47 to 7.53)
Treatment reported	7/2038 (3.03)	2.21 (0.88 to 5.55)	2.32 (0.86 to 5.80)
Unplanned or partly planned	13/6882 (1.89)	1.22 (0.56 to 2.62)	1.14 (0.52 to 2.49)

^*Adjusted for mother's age at delivery (<26 years, 26-30, 31-35, ≥36), smoking from conception to time of interview (no/yes), pre-pregnancy body mass index (<20, 20-24.9, 25-29.9, ≥30, missing), and social class (low, middle, high, missing). All covariates except age were self reported. When social class or body mass index were missing (4.8%), we included a separate category in the variable.