Ratios (95% CI) of geometric mean of air nicotine concentration by bar/restaurant characteristics
| Bar/restaurant characteristic | No. of venues | No. of samples | Geometric mean (95% CI) | Crude ratio (95% CI) | Adjusted ratio (95% CI) |
| Smoking status of the venue* | |||||
| Smoke free | 3 | 5 | 0.18 (0.08 to 0.41) | 1.0 (reference) | 1.0 (reference) |
| Mixed: smoke-free area | 17 | 17 | 0.60 (0.28 to 1.29) | 3.31 (0.75 to 14.68) | 3.24 (0.70 to 15.01) |
| Mixed: smoking area | 17 | 17 | 6.45 (2.61 to 15.92) | 36.3 (8.19 to 161.0) | 35.5 (7.56 to 164.6) |
| Smoking | 10 | 16 | 10.47 (7.29 to 15.02) | 58.9 (13.3 to 261.1) | 56.2 (12.1 to 260.9) |
| Type of venue* | |||||
| Restaurant | 12 | 23 | 0.97 (0.37 to 2.52) | 1.0 (reference) | 1.0 (reference) |
| Bar/pub | 18 | 32 | 5.24 (3.19 to 8.62) | 5.25 (1.86 to 14.8) | 6.17 (2.18 to 17.4) |
| Customers smoking inside (%)* | |||||
| Nobody | 2 | 3 | 0.09 (0.06 to 0.14) | 1.0 (reference) | 1.0 (reference) |
| <50% of the customers | 13 | 22 | 1.44 (0.64 to 3.25) | 15.9 (1.90 to 132.2) | 5.49 (0.37 to 82.4) |
| >50% of the customers | 15 | 30 | 6.60 (4.02 to 10.85) | 72.4 (8.69 to 604.2) | 10.7 (0.60 to 192.5) |
| Windows facing outdoors* | |||||
| No | 9 | 16 | 1.99 (0.80 to 4.92) | 1.0 (reference) | 1.0 (reference) |
| Yes | 21 | 39 | 2.81 (1.43 to 5.54) | 1.45 (0.53 to 4.89) | 0.95 (0.39 to 2.36) |
| Ventilation system† § | |||||
| No | 2 | 4 | 8.51 (2.88 to 25.14) | 1.0 (reference) | 1.0 (reference) |
| Yes | 28 | 51 | 2.34 (1.36 to 4.02) | 0.27 (0.03 to 2.24) | 1.26 (0.23 to 6.99) |
| Air conditioning† | |||||
| No | 12 | 22 | 5.12 (2.85 to 9.22) | 1.0 (reference) | 1.0 (reference) |
| Yes | 18 | 33 | 1.62 (0.75 to 3.49) | 0.31 (0.10 to 0.91) | 0.69 (0.29 to 1.63) |
| Volume‡ | |||||
| <289 m3 | 15 | 27 | 2.51 (1.11 to 5.66) | 1.0 (reference) | 1.0 (reference) |
| >289 m3 | 15 | 28 | 2.57 (1.24 to 5.29) | 1.02 (0.33 to 3.15) | 0.95 (0.40 to 2.25) |