Risk factors identified in the logistic regression in the 13–14 years group
| Males 13–14 | Females 13–14 | |||
| OR (95% CI) | P value | OR (95% CI) | P value | |
| In the past 12 months, have you had a problem with sneezing or a runny or blocked nose when you DID NOT have a cold or a influenza? | 2.986 (3.354 to 2.659) | <0.001 | 3.492 (3.825 to 3.188) | <0.001 |
| Have you ever had hay fever? | 2.144 (2.572 to 1.787) | <0.001 | 2.080 (2.378 to 1.819) | <0.001 |
| Have you had this itchy rash at any time in the past 12 months? | 1.950 (2.370 to 1.604) | <0.001 | 1.720 (1.957 to 1.511) | <0.001 |
| Have you ever had eczema? | 1.513 (2.017 to 1.135) | 0.005 | 1.243 (1.514 to 1.020) | 0.031 |
| How many times a week do you engage in vigorous physical activity long enough to make him/her breathe hard? Comparison never or occasionally | <0.001 | <0.001 | ||
| Once or twice per week | 1.240 (1.436 to 1.071) | 0.004 | 1.304 (1.446 to 1.176) | <0.001 |
| Three or more times per week | 1.452 (1.682 to 1.253) | <0.001 | 1.442 (1.627 to 1.277) | <0.001 |
| In the past 12 months, how often, on average, have you taken paracetamol for fever? Comparison never | <0.001 | <0.001 | ||
| At least once a year | 1.390 (1.639 to 1.178) | <0.001 | 1.480 (1.728 to 1.268) | <0.001 |
| At least once per month | 2.242 (2.676 to 1.879) | <0.001 | 2.312 (2.706 to 1.976) | <0.001 |
| Altitude (mamsl) comparison <100 m | <0.001 | <0.001 | ||
| 100 to <1000 m | 0.937 (1.119 to 0.785) | 0.474 | 0.916 (1.055 to 0.795) | 0.225 |
| >1000 to 1500 m | 0.874 (1.039 to 0.736) | 0.127 | 1.015 (1.156 to 0.891) | 0.826 |
| >1500 to <2000 m | 0.784 (0.929 to 0.661) | 0.005 | 0.870 (0.990 to 0.764) | 0.035 |
| >2000 to 2500 m | 0.638 (0.817 to 0.498) | <0.001 | 0.719 (0.869 to 0.595) | 0.001 |
| >2500 m | 0.609 (0.743 to 0.499) | <0.001 | 0.579 (0.687 to 0.489) | <0.001 |
| BMI class comparison normal weight | 0.065 | |||
| Underweight | 0.751 (1.069 to 0.528) | 0.112 | ||
| Overweight | 1.031 (1.194 to 0.891) | 0.679 | ||
| Obese | 1.177 (1.380 to 1.004) | 0.044 | ||
| During normal week of 7 days, how many hours a day (24 hours) do you spend on the computer (including PlayStation, Smartphone, Tablet) or on the internet (include chat, Facebook, games, Twitter, YouTube)? Comparison less than 1 hour | 0.01 | |||
| 1 hour but less than 3 hours | 1.127 (1.351 to 0.940) | 0.197 | ||
| 3 hours but less than 5 hours | 1.220 (1.476 to 1.009) | 0.04 | ||
| 5 hours or more | 1.333 (1.596 to 1.113) | 0.002 | ||
| How often do trucks pass through the street where you live on weekdays? Comparison never | 0.014 | |||
| Seldom (not often) | 0.861 (1.009 to 0.734) | 0.064 | ||
| Frequently through the day | 0.981 (1.169 to 0.823) | 0.827 | ||
| Almost the whole day | 1.102 (1.316 to 0.923) | 0.282 | ||
| In the past 12 months, how often, on average did you eat seafood (including fish)? Comparison never | 0.006 | |||
| Once or twice a week | 1.105 (1.250 to 0.976) | 0.114 | ||
| Most or all days | 1.524 (2.005 to 1.159) | 0.003 | ||
| In the past 12 months, how often, on average did you eat butter? Comparison never or only occasionally | 0.019 | |||
| Once or twice a week | 1.144 (1.291 to 1.014) | 0.029 | ||
| Most or all days | 1.267 (1.534 to 1.047) | 0.015 | ||
| In the past 12 months, how often, on average did you eat nuts? Comparison never | 0.03 | |||
| Once or twice a week | 1.086 (1.196 to 0.987) | 0.092 | ||
| Most or all days | 1.187 (1.358 to 1.037) | 0.013 | ||
| In the past 12 months, how often, on average did you eat sugar (including lolies, candies, sweets)? Comparison never | 0.001 | |||
| Once or twice a week | 0.994 (1.113 to 0.889) | 0.923 | ||
| Most or all days | 1.198 (1.347 to 1.066) | 0.003 | ||
| In the past, have you smoked tobacco on a daily basis, less than daily or not at all? Comparison not at all | <0.001 | |||
| Less than daily | 1.678 (1.927 to 1.461) | <0.001 | ||
| Daily | 1.819 (3.665 to 0.903) | 0.094 | ||
BMI, body mass index.