Table 1.

Sample characteristics.

	Generation R (n = 912)	ALSPAC (n = 828)
Child characteristics
Sex, % girls	48.4	48.9
Gestational age, weeks	40.2 (1.43)	39.6 (1.50)
Maternal characteristics
Age, years	31.7 (4.13)	29.56 (4.39)
PMSE score, log transformed	0.15 (0.11)	0.25 (0.14)
Smoking during pregnancy, %
never	77.5	87.1
until pregnancy was confirmed	7.7	3.4
continued	14.8	9.5

^*Values represent mean (standard deviation), unless otherwise specified.