Geometric means for indoor surface nicotine concentrations (μg/m2) by amount and sources of in-home SHS and building-related characteristics (n=279)
| 95% CI | ||||||
|---|---|---|---|---|---|---|
| n | % | Mean | Lower | Upper | p value | |
| Amount of indoor SHS | ||||||
| Average daily cigarettes smoked indoors | <0.001 | |||||
| None | 121 | 43.5 | 11.4 | 8.9 | 14.7 | |
| ≤1 | 43 | 15.5 | 26.1 | 17.4 | 39.4 | |
| >1 and ≤3 | 36 | 12.9 | 83.1 | 50.7 | 136.1 | |
| >3 and ≤7 | 34 | 12.2 | 182.8 | 120.3 | 277.8 | |
| >7 | 44 | 15.8 | 197.2 | 131.5 | 295.8 | |
| Sources of SHS | ||||||
| Respondent smoking status | ||||||
| Current | 128 | 45.9 | 113.4 | 87.9 | 146.2 | <0.001 |
| Former | 36 | 12.9 | 18.3 | 10.5 | 31.9 | |
| Never | 115 | 41.2 | 13.3 | 10.2 | 17.3 | |
| Respondent smokes indoors | ||||||
| Yes | 110 | 39.4 | 131.9 | 99.9 | 174.3 | <0.001 |
| No | 169 | 60.6 | 16.2 | 12.9 | 20.3 | |
| Other HH smoker | ||||||
| Yes | 44 | 15.9 | 87.4 | 54.6 | 139.9 | <0.001 |
| No | 233 | 84.1 | 31.8 | 25.2 | 40.0 | |
| Other HH member smokes indoors | ||||||
| Yes | 33 | 11.9 | 115.6 | 72.6 | 184.2 | <0.001 |
| No | 244 | 88.1 | 32.0 | 25.5 | 40.2 | |
| Visitors smoke indoors | ||||||
| Yes | 110 | 39.4 | 87.1 | 65.7 | 115.3 | <0.001 |
| No | 169 | 60.6 | 21.2 | 16.3 | 27.6 | |
| Other HH member or visitors smoke outdoors | ||||||
| Yes | 151 | 54.1 | 43.3 | 32.7 | 57.5 | 0.11 |
| No | 128 | 45.9 | 30.7 | 22.3 | 42.1 | |
| SHS incursion* | 0.03 | |||||
| Never | 102 | 68.0 | 14.8 | 11.1 | 19.9 | |
| Infrequent | 20 | 13.3 | 7.4 | 4.1 | 13.3 | |
| Frequent | 28 | 18.7 | 20.7 | 11.8 | 36.3 | |
| Building-related characteristics | ||||||
| Length of stay | <0.001 | |||||
| ≤2 months | 17 | 6.1 | 8.6 | 5.2 | 14.2 | |
| 3–6 months | 33 | 11.8 | 20.3 | 11.8 | 35.0 | |
| >6 months | 229 | 82.1 | 44.9 | 35.4 | 56.9 | |
| Unit location | ||||||
| Upper floor | 57 | 20.5 | 46.3 | 28.5 | 75.1 | 0.29 |
| Ground floor | 221 | 79.5 | 34.9 | 27.5 | 44.3 | |
| Units in building | ||||||
| ≤4 units | 120 | 44.8 | 40.0 | 29.6 | 54.0 | 0.35 |
| >4 units | 148 | 55.2 | 32.5 | 24.0 | 44.0 | |
| Size of unit | ||||||
| <820 sq. ft. | 139 | 49.8 | 37.7 | 27.7 | 51.3 | 0.86 |
| ≥820 sq. ft. | 140 | 50.2 | 36.3 | 27.0 | 48.6 | |
*Among non-smokers only. Infrequent=a few times a year or month; frequent=a few times per week or everyday.
SHS, secondhand smoke; HH, household.