Table 2

Prevalence (%) of asthma and wheeze at age 16–17 years in relation to environmental tobacco smoke (ETS) and personal daily smoking

Physician-diagnosed asthmaDifference p valueEver wheezeDifference p valueCurrent wheezeDifference p value
Exposure to tobacco smoke
In utero exposureNo12.50.04123.30.19919.70.032
Yes15.625.723.6
Maternal ETS at age 7–8 yearsNo12.00.00822.00.00219.20.005
Yes15.827.524.0
Maternal ETS at age 16–17 yearsNo12.40.02322.60.00519.50.009
Yes16.027.924.2
Continuous maternal ETSNo12.50.00222.90.00219.90.016
Yes18.130.225.1
Paternal ETS at age 7–8 yearsNo12.40.35222.90.39819.30.018
Yes13.924.623.9
Paternal ETS at age 16–17 yearsNo12.90.63623.30.29319.90.150
Yes13.725.522.8
Continuous paternal ETSNo13.30.84723.90.97220.20.050
Yes12.824.126.2
Smoking habits
Daily smokingNo12.90.02522.8<0.00119.3<0.001
Yes18.036.834.7