Table 3.

Adjusted odds ratios^† (95% confidence intervals) for adverse outcomes in first and second births to women aged 15 to 19 compared with women aged 20-29 (smokers)

Outcomes	First births (n=38 087)	Second births (n=25 992)
Birth weight <5th percentile	0.8 (0.7 to 0.9)***	0.8 (0.6 to 1.0)*
Delivery 24-32 weeks	1.1 (0.9 to 1.4)	2.1 (1.5 to 2.9)***
Delivery 33-36 weeks	1.1 (1.0 to 1.3)**	1.5 (1.2 to 1.8)***
Stillbirth	0.9 (0.7 to 1.2)	0.5 (0.2 to 1.2)
Neonatal death	1.4 (0.9 to 2.1)	2.5 (1.3 to 4.8)**
Emergency caesarean section	0.5 (0.5 to 0.6)***	0.7 (0.6 to 0.9)**

^*P<0.05, ^**P<0.01, ^***P<0.001. ^†Odds ratios adjusted for maternal height category, socioeconomic deprivation quintile, previous spontaneous and therapeutic abortions, and year (risks associated with second births also adjusted for previous perinatal death).