Variables | All (N = 1765) | Boys (n = 918) | Girls (n = 847) | P * | |||
---|---|---|---|---|---|---|---|
n | (%) | n | (%) | n | (%) | ||
In utero life | |||||||
Prenatal maternal smoking | 450 | 25.50 | 228 | 24.84 | 222 | 26.21 | 0.48 |
Traffic-related air pollution | 501 | 28.39 | 246 | 26.80 | 255 | 30.11 | 0.10 |
First year of life | |||||||
Heavy parental smoking in the last 12 months | 227 | 12.86 | 113 | 12.31 | 114 | 13.46 | 0.75 |
Traffic-related air pollution in the last 12 months | 372 | 21.08 | 201 | 21.90 | 171 | 20.19 | 0.61 |
Dampness in the last 12 months | 86 | 4.87 | 46 | 5.01 | 40 | 4.72 | 0.90 |
Visible moulds in the last 12 months | 76 | 4.31 | 41 | 4.47 | 35 | 4.13 | 0.84 |
Bleaching agents in the last 12 months | 102 | 5.78 | 50 | 5.45 | 52 | 6.14 | 0.46 |
House dust mites in the last 12 months | 209 | 11.84 | 117 | 12.75 | 92 | 10.86 | 0.29 |
Cats in the past 12 months | 156 | 8.84 | 79 | 8.61 | 77 | 9.09 | 0.75 |
Dogs in the past 12 months | 117 | 6.63 | 65 | 7.08 | 52 | 6.14 | 0.45 |
Domestic heating in the last 12 months | |||||||
Electricity | 353 | 20.00 | 187 | 20.37 | 166 | 19.60 | 0.24 |
Gas | 736 | 41.70 | 383 | 41.72 | 353 | 41.68 | |
Petroleum | 314 | 17.79 | 160 | 17.43 | 154 | 18.18 | |
Wood | 79 | 4.48 | 47 | 5.12 | 32 | 3.78 | |
Others | 45 | 2.55 | 30 | 3.27 | 15 | 1.77 |