Table 1

 Description of the study cohort

VariableMunich metropolitan area (including Munich city)Munich city
Prevalence n/N %Prevalence n/N %
ETS, environmental tobacco smoke.
*Lifetime prevalences.
Symptoms and diseases
At the age of 1 year*
    Wheezing471/ 3037 15.5258/1722 15.0
    Cough without infection261/2908 9.0151/1655 9.1
    Dry cough at night207/3056 6.8123/1737 7.1
    Doctor-diagnosed bronchial asthma12/3055 0.46/1731 0.4
    Doctor-diagnosed asthmatic/spastic/obstructive bronchitis356/3059 11.6196/1735 11.3
    Doctor-diagnosed respiratory infections2168/3052 71.01212/1728 70.1
    Sneezing, running/stuffed nose without a cold406/3067 13.2254/1743 14.6
At the age of 2 years*
    Wheezing746/2882 25.9416/1627 25.6
    Dry cough at night387/2866 13.5228/1614 14.1
    Doctor-diagnosed bronchial asthma26/2833 0.916/1600 1.0
    Doctor-diagnosed asthmatic/spastic/obstructive bronchitis555/2861 19.4303/1616 18.8
    Doctor-diagnosed respiratory infections2733/3021 90.51528/1695 90.2
    Sneezing, running/stuffed nose without a cold610/2907 21.0354/1638 21.6
Confounding variables
Female sex1489/3129 52.4832/1756 47.4
Parental atopy1667/3577 46.6935/1756 53.3
ETS at home646/3008 21.5398/1704 23.4
Maternal education
    <12 grades925/ 3113 29.7633/1751 36.1
    ⩾12 grades1853/3113 59.51118/1751 63.9
Siblings1358/ 3080 44.1700/1712 40.9
Use of gas for cooking253/3075 8.2221/1731 12.8
Home dampness218/3080 7.1115/1731 6.6
Indoor moulds934/3082 30.3534/1735 30.8
Keeping pets658/3100 21.2318/1739 18.3
Cat304/ 3092 9.8159/1735 9.2
Dog160/3092 5.270/1735 4.0