Table 3. OR and 95% CI of logistic regression analysis of SHS exposure at home.
| Categorical variables | At home | |||
|---|---|---|---|---|
| Male | Female | |||
| OR | 95% CI | OR | 95% CI | |
| Social and demographic factors | ||||
| Age | ||||
| Younger (19-39 yr) | Ref | |||
| Middle-aged (40-59 yr) | 0.384† | 0.341-0.432 | 1.022 | 0.971-1.076 |
| Older (60 yr and older) | 0.422† | 0.359-0.495 | 0.671† | 0.622-0.724 |
| Education | ||||
| ≤ Elementary school | Ref | |||
| Middle school | 0.891 | 0.742-1.069 | 0.928* | 0.867-0.994 |
| High school | 0.826† | 0.700-0.974 | 0.86† | 0.806-0.918 |
| College or higher | 0.695† | 0.581-0.832 | 0.593† | 0.550-0.640 |
| Household income yearly | ||||
| 1st quartile (lowest) | Ref | |||
| 2nd quartile | 0.972 | 0.842-1.121 | 0.999 | 0.942-1.061 |
| 3rd quartile | 0.935 | 0.803-1.090 | 0.955 | 0.895-1.020 |
| 4th quartile (highest) | 0.896 | 0.761-1.055 | 0.822† | 0.766-0.882 |
| Location of residence | ||||
| Rural area | Ref | |||
| Urban area | 0.995 | 0.896-1.106 | 1.058* | 1.012-1.106 |
| Health-related factors | ||||
| Smoking status | ||||
| Never smoker | Ref | |||
| Ex-smoker | 0.658† | 0.599-0.723 | 1.246† | 1.112-1.395 |
| Drinking | ||||
| No | Ref | |||
| Yes | 1.258† | 1.125-1.406 | 1.427† | 1.37-1.486 |
| Physical activity | ||||
| No | Ref | |||
| Yes | 1.33† | 1.217-1.454 | 1.297† | 1.241-1.355 |
| Home-related factors | ||||
| House form | ||||
| Detached house | Ref | |||
| Apartment house | 0.729† | 0.652-0.814 | 0.831† | 0.793-0.872 |
| Row house | 1.101 | 0.922-1.314 | 1.030 | 0.953-1.114 |
| Multiplex house | 0.903 | 0.758-1.075 | 1.031 | 0.957-1.111 |
| Commercial building house | 1.514† | 1.156-1.982 | 1.259† | 1.109-1.428 |
| Other | 1.029 | 0.601-1.759 | 1.044 | 0.799-1.363 |
| Family type | ||||
| Couple | Ref | |||
| Single-person household | 0.827 | 0.653-1.047 | 5.431† | 4.851-6.081 |
| The first generation or other sibling or relatives | 3.234† | 2.337-4.475 | 5.639† | 4.682-6.792 |
| Couple with unmarried children | 2.043† | 1.635-2.553 | 7.016† | 6.237-7.891 |
| Single father with unmarried children | 3.866† | 2.821-5.297 | 13.442† | 10.675-16.927 |
| Single mother with unmarried children | 1.485* | 1.082-2.039 | 3.743† | 3.262-4.296 |
| Couple with their parents or single-parent | 2.229† | 1.606-3.094 | 5.724† | 4.921-6.659 |
| Grandparents or single-grandfather or single-grandmother with unmarried grandchildren | 1.238 | 0.670-2.287 | 4.482† | 3.522-5.705 |
| Couple with children and couple's brothers or sisters or other type of second-generation family | 3.26† | 2.412-4.405 | 6.717† | 5.77-7.82 |
| Three-generation family | 2.456† | 1.920-3.141 | 6.951† | 6.144-7.865 |
OR, odds ratio; 95% CI, 95% confidence interval; SHS, secondhand smoke.
* P value less than 0.05; † P value less than 0.01.