Multivariate analysis ORs
| Parameter | 95% CI | ||
| Odds ratio | Lower | Upper | |
| Renter | 1.705 | 1.089 | 2.669 |
| Non-single-family house | 1.042 | 0.663 | 1.638 |
| Number in household | |||
| Under 18 | 1.233 | 1.062 | 1.432 |
| 18–64 | 1.059 | 0.889 | 1.261 |
| Over 64 | 0.384 | 0.211 | 0.699 |
| Household head education | |||
| Some college | 1.252 | 0.752 | 2.085 |
| College graduate | 1.513 | 0.975 | 2.347 |
| Postgraduate | 2.094 | 1.252 | 3.502 |
| Number of smokers | 1.383 | 1.139 | 1.680 |
Non-cooking fire household subset compared with non-fire households.