Table 1 Different personal measurement methods at baseline, follow-up 1 and follow-up 2
Baseline | Follow-up 1 | Follow-up 2 | ||||||
|---|---|---|---|---|---|---|---|---|
n | Arithmetic mean (95% CI) | n | Arithmetic mean (95% CI) | n | Arithmetic mean (95% CI) | p-Value | ||
Personal badge (cigarette equivalents/day) | Intervention group | 53 | 2.18 (1.31 to 3.05) | 41 | 0.53 (0.39 to 0.67) | 41 | 0.25 (0.13 to 0.36) | <0.001 |
Control Groups I + III | 20 | 1.69 (0.74 to 2.64) | 11 | 1.17 (0.57 to 1.77) | 5 | 1.22 (0.10 to 2.34) | 0.892 | |
Control Group II | 14 | 0.41 (0.25 to 0.57) | ||||||
Work place badge (cigarette equivalents/day)* | Intervention group | 50 | 4.82 (3.14 to 6.50) | 40 | 0.27 (0.19 to 0.34) | 36 | 0.31 (0.17 to 0.46) | <0.001 |
Control Group I | 6 | 3.85 (−0.51 to 8.21) | 2 | 2.15 (−23.66 to 27.96) | 1 | 0.22 | 0.561 | |
Control Group II | 12 | 0.27 (0.08 to 0.47) | ||||||
Time weighted average of work badge (cigarette equivalents/day)* | Intervention group | 50 | 2.65 (1.69 to 3.62) | 40 | 0.15 (0.11 to 0.20) | 36 | 0.18 (0.10 to 0.27) | <0.001 |
Control Group I | 6 | 2.24 (−0.30 to 4.79) | 2 | 1.25 (−13.80 to 16.31) | 1 | 0.30 | 0.561 | |
Control Group II | 12 | 0.14 (0.03 to 0.25) | ||||||
Salivary nicotine (ng/ml) | Intervention group | 44 | 1.99 (0.98 to 3.00) | 35 | 2.42 (−0.01 to 4.86) | 36 | 2.81 (−0.12 to 5.75) | 0.227 |
Control Groups I + III | 14 | 1.45 (−0.05 to 2.95) | 5 | 4.24 (−5.49 to 13.97) | 1 | 7.80 | 0.699 | |
Control Group II | 5 | 2.38 (−3.95 to 8.71) | ||||||
Salivary cotinine (ng/ml) | Intervention group | 44 | 0.67 (0.04 to 1.30) | 35 | 2.75 (0.32 to 5.17) | 36 | 0.81 (0.00 to 1.61) | 0.243 |
Control Groups I + III | 14 | 1.54 (−0.43 to 3.51) | 5 | 3.84 (−2.56 to 10.24) | 1 | 0.13 | 0.329 | |
Control Group II | 5 | 2.82 (−4.73 to 10.37) | ||||||