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)

*no data for control group III.

1if two persons worked in the same venue, this badge was counted double.

Rajkumar et al.

Rajkumar et al. BMC Public Health 2013 13:536   doi:10.1186/1471-2458-13-536

Open Data