| Schools# | |
| Full-time classrooms (compared with other locations in school) | 1.21 (1.13–1.3) |
| Higher grade (1 grade increase) | 0.98 (0.97–1.00) |
| Occupancy of school (five persons increase) | 1.04 (0.99–1.10) |
| Building age (10-year increase) | 1.00 (0.97–1.03) |
| Moisture/mould observations | 1.15 (0.95–1.39) |
| Type of floor | |
| Smooth floor without carpet | Reference |
| Smooth floor with carpet | NA |
| Carpet | 0.96 (0.67–1.39) |
| Homes¶ | |
| Higher grade at school (1 grade increase) | 1.03 (0.98–1.07) |
| Number of occupants (1 person increase) | 1.14 (1.06–1.22) |
| Building age (10-year increase) | 0.96 (0.94–0.99) |
| Moisture/mould observations | 1.02 (0.90–1.16) |
| Type of floor | |
| Smooth floor without carpet | Reference |
| Smooth floor with carpet | 1.03 (0.90–1.18) |
| Carpet | 0.99 (0.85–1.15) |
| Smoke inside | 1.00 (0.91–1.09) |
| Pets in home | 1.04 (0.93–1.17) |
| Pets in bedroom | 0.90 (0.78–1.04) |
| Education level parents | |
| High | Reference |
| Intermediate | 0.89 (0.79–1.01) |
| Low | 1.04 (0.80–1.35) |
| Parental allergies | 1.03 (0.89–1.18) |
Data are presented as geometric mean ratio (95% confidence interval). NA: not available. #: n = 148; ¶: n = 169.