Table 1.

Characteristics of the mothers and newborns in START and MoBa1.

Characteristics	START n = 956	MoBa1 n = 1062	p valuea
Mothers
Age (years), mean (SD)	29.9 (4.7)	29.9 (4.3)	0.800
Smoking, n (%)			0.033
No smoking before or during pregnancy	478 (50%)	522 (49%)
Smoked, but quit before pregnancy	245 (26%)	233 (22%)
Smoked, but quit early in pregnancy	131 (14%)	154 (15%)
Continued smoking during pregnancy	102 (11%)	153 (14%)
Newborns
GA in days, mean (SD)	280.1 (10.7)	279.8 (10.8)	0.400
GA in days, min	216	209
GA in days, max	305	301
Birth weight in grams, mean (SD)	3657 (521)	3643 (539)	0.500
Sex (male), n (%)	455 (47%)	569 (54%)	0.007

SD standard deviation, GA gestational age.

^aWilcoxon rank-sum test; Pearson’s Chi-squared test.