Variable | Totala | Allergic rhino-conjunctivitis (%) | Crude OR (95 % CI) | P | Adjusted OR (95 % CI)b | P |
---|---|---|---|---|---|---|
Mode of transport to school | ||||||
Walk | 1728 | 20.7 | 1 | 1 | ||
Taxi/Bus | 708 | 22.3 | 1.09 (0.88–1.35) | 0.387 | 1.06 (0.84–1.33) | 0.615 |
Motor car | 683 | 24.6 | 1.25 (1.01–1.54) | 0.033 | 1.19 (0.87–1.62) | 0.260 |
Combination | 201 | 26.4 | 1.53 (1.10–2.12) | 0.011 | 1.44 (0.98–2.11) | 0.054 |
Other | 100 | 27.0 | 1.46 (0.92–2.30) | 0.105 | 1.57 (0.96–2.57) | 0.068 |
Frequency of trucks passing near homes on weekdays | ||||||
Never | 563 | 18.8 | 1 | 1 | ||
Seldom | 1033 | 23.0 | 1.23 (0.95–1.59) | 0.113 | 1.17 (0.89–1.54) | 0.234 |
Frequently through the day | 580 | 19.0 | 1.01 (0.75–1.37) | 0.904 | 0.96 (0.70–1.30) | 0.799 |
Almost all day | 1212 | 25.7 | 1.54 (1.20–1.97) | 0.001 | 1.42 (1.09–1.84) | 0.008 |
Sex | ||||||
Female | 1790 | 25.8 | 1 | 1 | ||
Male | 1634 | 18.9 | 0.67 (0.57–0.79) | 0.000 | 0.68 (0.57–0.81) | 0.000 |
Being born in Tembisa/Kempton park areas | ||||||
No | 1609 | 20.7 | 1 | 1 | ||
Yes | 1812 | 24.0 | 1.27 (1.07–1.50) | 0.004 | 1.22 (1.02–1.45) | 0.024 |
Vigorous physical activity | ||||||
Never or occasionally | 984 | 18.4 | 1 | 1 | ||
Once or twice per week | 1417 | 24.8 | 1.45 (1.19–1.78) | 0.000 | 1.42 (1.16–1.76) | 0.001 |
3 or more times per week | 983 | 23.3 | 1.33 (1.06–1.65) | 0.011 | 1.34 (1.06–1.68) | 0.012 |
Hours watching TV during normal week | ||||||
Less than 1 h | 532 | 19.6 | 1 | |||
1 h but less than 3 h | 835 | 19.8 | 0.97 (0.74–1.28) | 0.873 | 0.93 (0.69–1.24) | 0.622 |
3 h but less than 5 h | 827 | 23.1 | 1.20 (0.91–1.57) | 0.180 | 1.15 (0.87–1.53) | 0.313 |
5 h or more | 1213 | 25.1 | 1.37 (1.07–1.77) | 0.012 | 1.37 (1.06–1.78) | 0.016 |
Residential heating fuel type most frequently used | ||||||
Electricity | 2041 | 21.5 | 1 | 1 | ||
Gas | 426 | 29.3 | 1.50 (1.18–1.89) | 0.001 | 1.45 (1.14–1.85) | 0.002 |
Paraffin | 631 | 20.1 | 0.96 (0.76–1.22) | 0.760 | 0.95 (0.75–1.22) | 0.739 |
Open fires (wood, coal) | 270 | 24.1 | 1.18 (0.87–1.59 | 0.276 | 1.18 (0.86–1.61) | 0.291 |