Table 2.

Study population —MoBa 2

Covariate	Occurrence/mean value	N
Child’s sex, male	56.1 %	384/685
Mean age of mother at birth	30.0 (95 % CI 29.7–30.3)	685
Maternal smoking during pregnancy	10.2 %	70/685
Caesarian section	13 %	89/685
Asthma at 3 years	21.3 %	104/489
Ultrasound estimated GA	279.4 (95 % CI 278.5–280.2)	644
LMP estimated GA	281.5 (95 % CI 280.7–282.4)	615

CI confidence interval