Tobacco smoke pollution in smoker and non-smoker homes before (part 1) and after (part 2) the change of occupancy
| Part 1: original occupants, N mean (95% CI) | Part 2: new non-smoker occupants, N mean (95% CI) | |
| Indoor smoking, cigarettes/week | ||
| All non-smoker homes | 50 0 | 16 0 |
| All smoker homes | 94 60.17 (49.60 to 72.96) | 25 0 |
| Same non-smoker homes | 16 0 | 16 0 |
| Same smoker homes | 25 68.57 (46.94 to 99.94) | 25 0 |
| Air nicotine, μg/m3 | ||
| Living room: | ||
| All non-smoker homes | 50 0.02 (0.01 to 0.03) | 16 0.14 (0.00 to 0.34) |
| All smoker homes | 81* 1.86 (1.38 to 2.44) | 23 0.20 (0.07 to 0.34) |
| Same non-smoker homes | 16 0.04 (0.00 to 0.07) | 16 0.14 (0.00 to 0.34) |
| Same smoker homes | 19 1.96 (1.01 to 3.34) | 19 0.23 (0.07 to 0.41) |
| Bedroom: | ||
| All smoker homes | 74† 1.44 (1.00 to 1.97) | 22 0.12 (0.04 to 0.19) |
| Same smoker homes | 19 1.55 (0.75 to 2.73) | 19 0.13 (0.05 to 0.22) |
| Surface nicotine, μg/m2 | ||
| Living room: | ||
| All non-smoker homes | 50 1.6 (0.8 to 3.0) | 16 1.5‡ (0.4 to 3.7) |
| All smoker homes | 94 98.7 (61.2 to 158.6) | 24 10.0‡ (3.1 to 28.6) |
| Same non-smoker homes | 16 1.4 (0.3 to 3.6) | 16 1.5‡ (0.4 to 3.7) |
| Same smoker homes | 24 211.7 (85.2 to 523.9) | 24 10.0‡ (3.1 to 28.6) |
| Bedroom: | ||
| All smoker homes | 87 50.1 (29.4 to 84.7) | 23 7.5 (1.9 to 24.4) |
| Same smoker homes | 23 66.1 (24.8 to 173.5) | 23 7.5 (1.9 to 24.4) |
| Dust nicotine, μg/g | ||
| Living room: | ||
| All non-smoker homes | 50 2.9 (1.1 to 4.0) | 16 2.3§ (1.0 to 4.4) |
| All smoker homes | 93 39.6 (30.0 to 52.2) | 25 10.9§ (6.4 to 18.2) |
| Same non-smoker homes | 16 2.7 (1.1 to 5.3) | 16 2.3§ (1.0 to 4.4) |
| Same smoker homes | 25 47.6 (26.6 to 84.7) | 25 10.9§ (6.4 to 18.2) |
| Bedroom: | ||
| All smoker homes | 76 30.7 (22.2 to 42.2) | 23 11.0 (6.0 to 19.6) |
| Same smoker homes | 23 40.4 (23.1 to 70.2) | 23 11.0 (6.0 to 19.6) |
| Dust nicotine, μg/m2 | ||
| Living room: | ||
| All non-smoker homes | 49 3.6 (2.2 to 5.6) | 16 3.1 (0.8 to 8.3) |
| All smoker homes | 92 58.8 (40.9 to 84.3) | 25 7.6 (3.6 to 15.3) |
| Same non-smoker homes | 15 4.2 (1.3 to 10.6) | 15 3.4 (0.8 to 9.6) |
| Same smoker homes | 25 76.2 (33.1 to 173.8) | 25 7.6 (3.6 to 15.3) |
| Bedroom: | ||
| All smoker homes | 73 51.0 (34.7 to 74.8) | 21 7.3 (3.0 to 16.3) |
| Same smoker homes | 21 75.4 (36.7 to 153.9) | 21 7.3 (3.0 to 16.3) |
↵* Part 1 living room air monitors were not placed in nine smoker homes because residents were moving in <7 days, and air monitors were not returned by residents of four smoker homes.
↵† Part 1 bedroom air monitors were not placed in nine smoker homes because residents were moving in <7 days, or in six studio apartments, and were not returned by residents of five smoker homes.
↵‡ p=0.0059 (directional) part 2 non-smoker versus former smoker homes.
↵§ p=0.0002 (directional) part 2 non-smoker versus former smoker homes.