Children with complete data—intervention versus control group
| Intervention group (n=135) | Control group (n=134) | Significance of difference | |||
| Sex (male) | 56% | 75 | 63% | 85 | 0.23 |
| Parental asthma | 56% | 75 | 57% | 76 | 0.95 |
| Ethnicity | |||||
| Māori | 31% | 42 | 34% | 45 | 0.60 |
| Pacific Island | 24% | 33 | 19% | 25 | 0.31 |
| NZ European | 64% | 86 | 70% | 94 | 0.32 |
| Other | 11% | 15 | 7.5% | 10 | 0.41 |
| Region | |||||
| Porirua | 25% | 34 | 28% | 38 | 0.65 |
| Hutt Valley | 28% | 38 | 20% | 27 | 0.16 |
| Christchurch | 33% | 45 | 33% | 44 | 0.97 |
| Dunedin/Bluff | 13% | 18 | 19% | 25 | 0.31 |
| School | |||||
| Contributing | 34% | 46 | 29% | 39 | 0.46 |
| Full primary | 32% | 43 | 33% | 44 | 0.97 |
| Intermediate | 20% | 27 | 19% | 26 | 0.98 |
| Secondary | 14% | 19 | 19% | 25 | 0.39 |
| Income | |||||
| <$38 000 | 44% | 60 | 31% | 42 | 0.04 |
| $38 000–$60 000 | 21% | 28 | 33% | 44 | 0.04 |
| >$60 000 | 16% | 22 | 18% | 24 | 0.48 |
| Not specified | 19% | 25 | 18% | 24 | 0.98 |
| Smoking inside | 21% | 28 | 22% | 29 | 0.97 |