Children with complete versus incomplete data
| Complete data (n=269) | Incomplete (or no) data (n=80) | Significance of difference | |||
| Sex (male) | 59% | 160 | 53% | 42 | 0.62 |
| Parental asthma | 56% | 151 | 45% | 36 | 0.10 |
| Ethnicity | |||||
| Māori | 32% | 87 | 49% | 39 | 0.01 |
| Pacific Island | 22% | 58 | 9% | 7 | 0.01 |
| NZ European | 67% | 180 | 58% | 47 | 0.22 |
| Other | 9.3% | 25 | 59% | 5 | 0.53 |
| Region | |||||
| Porirua | 27% | 72 | 8% | 6 | 0.0005 |
| Hutt Valley | 24% | 65 | 56% | 45 | <0.0001 |
| Christchurch | 33% | 89 | 5% | 4 | <0.0001 |
| Dunedin/Bluff | 16% | 43 | 31% | 25 | 0.004 |
| School | |||||
| Contributing | 32% | 85 | 35% | 28 | 0.66 |
| Full primary | 32% | 87 | 43% | 34 | 0.12 |
| Intermediate | 20% | 53 | 14% | 11 | 0.30 |
| Secondary | 16% | 44 | 9% | 7 | 0.13 |
| Income | |||||
| <$38 000 | 38% | 102 | 39% | 31 | 0.98 |
| $38 000–$60 000 | 27% | 72 | 19% | 15 | 0.19 |
| >$60 000 | 17% | 46 | 25% | 20 | 0.16 |
| Not specified | 18% | 49 | 18% | 14 | 0.98 |
| Smoking inside | 21% | 57 | 21% | 17 | 0.89 |