Children of MZ +DZ twin mothers: Analyses of association between mother’s level of anxiety as well as her twin sister’s levels and asthma in the child as reported in questionnaires and recorded in registers.

1Breathlessness reported by child was only available for study 2.
2At least two purchases of asthma medication, except oral beta-2-agonists, on different days July 2005– December 2009.
3Maternal anxiety assessed with BAI was only available for study 2.
4Spearman’s correlation coefficient between twin sisters (continuous scale) is 0.30 for BAI; 0.33 for Somatic anxiety; 0.34 for Psychic anxiety.
All analyses adjusted for mother’s education, maternal smoking at time of the study, maternal asthma, sex and age of the child, preterm birth, birth weight and caesarean section.