Table 1.

Smoking Exposure in First and Second Pregnancy During the Study Period

Maternal smoking	First pregnancy		Second pregnancy
	n	%	n	%
No	124 197	82.7	126 728	84.4
Yes	21 891	14.6	19 877	13.3
No information	4080	2.7	3563	2.4
Total	150 168	100.0	150 168	100.0