| Athens n = 1000 % | Thessaloniki n = 1023 % | p | All n = 2023 % |
Sex (male) | 46.1 | 49.7 | 0.11 | 47.9 |
Preterm infant | 15.5 | 16.3 | 0.69 | 15.9 |
Both parents with academic education | 22.8 | 57.0 | <0.01 | 39.9 |
Mother smoking habits | 32.6 | 29.8 | 0.19 | 31.2 |
Maternal history of eczema | 9.7 | 10.2 | 0.76 | 9.9 |
Paternal history of eczema | 7.3 | 6.6 | 0.54 | 6.9 |
Breast feeding | 78.6 | 74.7 | 0.03 | 76.6 |
Attending nursery school before the age of 2 y | 13 | 10.8 | 0.13 | 11.9 |
Bedroom sharing | 78.4 | 78.1 | 0.91 | 78.3 |
Pets ownership | 8.3 | 12.2 | 0.04 | 10.3 |
Farm animals exposure | 1.6 | 2.4 | 0.20 | 2 |
Air-condition in the house | 11.3 | 7.2 | <0.01 | 9.2 |
Central heating in the house | 76.6 | 40.4 | <0.01 | 58.2 |
Dampness in the house | 13.2 | 8.4 | <0.01 | 10.8 |
Visible moulds in the house | 7.8 | 5 | <0.01 | 6.4 |
Fitted carpets in child bedroom | 57.9 | 29.3 | <0.01 | 43.5 |
Use of foam pillows | 14.1 | 11.9 | 0.14 | 13 |
Use of synthetic pillows | 14.2 | 14 | 0.89 | 14.1 |
Use of feather pillows | 25.8 | 29.2 | 0.08 | 27.5 |
Use of synthetic quilts | 22.7 | 17.1 | 0.02 | 19.9 |
Use of feather quilts | 13.5 | 9 | 0.02 | 11.2 |
Use of blankets | 68.2 | 75.8 | <0.01 | 72 |