Table 1 Demographic and clinical characteristics of the sample (n = 7344)
Variable | Class | N | % | Weighted %a |
|---|---|---|---|---|
Age in years | 6–7 years | 3681 | 50.1 | 62.7 |
13–14 years | 3663 | 49.9 | 37.3 | |
Sex | Girl | 3355 | 45.7 | 41.2 |
Boy | 3989 | 54.3 | 58.8 | |
Ever had wheezing | No | 6949 | 94.6 | 95.0 |
Yes | 395 | 5.4 | 5.0 | |
Wheezing in the last 12 months (Current wheeze) | No | 7045 | 95.9 | 96.0 |
Yes | 299 | 4.1 | 4.0 | |
Asthma ever | No | 7135 | 97.2 | 97.6 |
Yes | 209 | 2.8 | 2.4 | |
Rhinitis ever | No | 6904 | 94.0 | 94.7 |
Yes | 440 | 6.0 | 5.3 | |
Rhinitis in the last 12 months | No | 6961 | 94.8 | 95.3 |
Yes | 383 | 5.2 | 4.7 | |
Hay fever ever | No | 7033 | 95.8 | 96.5 |
Yes | 311 | 4.2 | 3.5 | |
Eczema ever | No | 7249 | 98.7 | 99.0 |
Yes | 95 | 1.3 | 1.0 | |
Family history of asthma and other allergic diseases | No | 6043 | 82.3 | 82.8 |
Yes | 1301 | 17.7 | 17.2 | |
Birth weight | Normal | 7109 | 96.8 | 97.5 |
Low | 235 | 3.2 | 2.5 | |
Breast feeding | Breast milk | 6226 | 84.8 | 85.9 |
Milk Powder | 314 | 4.3 | 3.8 | |
Both | 804 | 10.9 | 10.3 | |
Smoker in the household | No | 6411 | 87.3 | 88.3 |
Yes | 933 | 12.7 | 11.7 | |
Pets in the home | No | 6280 | 85.5 | 88.4 |
Yes | 1064 | 14.5 | 11.6 | |
Area of residence | North | 1161 | 15.8 | 17.8 |
South | 1501 | 20.4 | 16.9 | |
East | 520 | 7.1 | 5.0 | |
West | 1320 | 18.0 | 11.4 | |
Center | 2842 | 38.7 | 48.9 |