Table 1

 Prevalence of subject characteristics, heating types and other exposures

Prevalence†
Subject characteristics
Recent wheeze160 (25.9%)
AHR (PD20 FEV1<3.9 μmol)108 (19.3%)
Current asthma62 (11.2%)
Diagnosed asthma207 (33.3%)
Atopy216 (36.2%)
Male sex292 (46.7%)
Parental asthma218 (38.2%)
1st year of lifeCurrent
AHR = airway hyperresponsiveness.
*Some participants in the study may have more than one type of heating.
†The denominator population ranges from 560 to 627 because of missing data for some variables.
Heating types*
No heating23 (3.8%)33 (5.3%)
Non-fume emitting:409 (65.7%)462 (73.8%)
    Central heating46 (7.6%)43 (6.9%)
    Electric heating283 (46.9%)220 (35.1%)
    Reverse cycle heating89 (14.7%)210 (33.5%)
Fume emitting:242 (40.2%)229 (36.7%)
    Flued gas24 (4.0%)17 (2.7%)
    Non-flued gas83 (13.7%)115 (18.3%)
    Open fire57 (9.4%)27 (4.3%)
    Wood stove86 (14.2%)72 (11.5%)
    Kerosene8 (1.3%)5 (0.8%)
Other exposures
Maternal smoking154 (26.2%)150 (24%)
Other family members smoke114 (19.5%)86 (13.9%)
Gas cooking94 (15%)112 (17.9%)
Ever kept pets528 (84.6%)