Adjusted ORs (95% CI) of symptom occurrence per hour of use for heater type
| Wheeze | Cough | Dyspnoea | ||||
| Same day | Lag 1 | Same day | Lag 1 | Same day | Lag 1 | |
| Hours of UFGH use (n=33 patients; 1713 days) | 1.05 (1.02 to 1.08)* | 1.05 (1.02 to 1.08)* | 0.97 (0.90 to 1.04) | 0.97 (0.90 to 1.05) | 1.07 (1.02 to 1.13)* | 1.07 (1.02 to 1.13)* |
| Hours of other heater use (n=38 patients; 2421 days) | 1.00 (0.98 to 1.02) | 0.99 (0.97 to 1.01) | 1.01 (0.97 to 1.05) | 1.01 (0.97 to 1.05) | 0.99 (0.95 to 1.04) | 0.99 (0.95 to 1.03) |
Adjusted for age, gender, exposure to tobacco smoke, exposure to cooking gas, ambient temperature, humidity and external NO2 levels.
↵* Significant finding (p<0.05).
UFGH, unflued gas heater.