Prevalence of house characteristics among case and control subjects
| House characteristics | Asthmatics % | Nonasthmatics % | p‐value |
| Gas heater (unflued) | 39 | 35 | 0.6 |
| New carpet | 17 | 9 | 0.12 |
| Newly-painted surfaces indoors | 28 | 17 | 0.06 |
| New furniture | 24 | 19 | 0.45 |
| Floor boards | 24 | 14 | 0.09 |