Table 3

 Mean (95% confidence interval) exposure to secondhand smoke for respondents by wave

Exposure to secondhand smokeBaseline3 month6 month12 monthp Value*Trend‡
Note: Two respondents had incomplete job descriptions at baseline and were excluded from the analyses.
*p Values from baseline to 12 month follow up McNemar χ2 test unless otherwise noted.
†p Values from baseline to 12 month follow up Wilcoxon sign rank test.
‡p Values from Cuzick non-parametric trend test across all waves.
Proportion exposed to secondhand smoke at hospitality workplaces0.91 (0.67 to 0.98)0.18 (0.06 to 0.42)0.05 (0.01 to 0.30)0.14 (0.04 to 0.37)<0.001<0.001
Total hours exposed to secondhand smoke14.5 (10.5 to 18.6)2.9 (−0.27 to 6.04)1.4 (0.15 to 2.63)0.8 (−0.01 to 1.6)<0.001†<0.001
Hours exposed to secondhand smoke at hospitality workplaces12.1 (8.0 to 16.3)1.6 (−1.01 to 4.23)0.07 (−0.07 to 0.21)0.2 (−0.06 to 0.47)<0.001†<0.001
Hours exposed to secondhand smoke at all other locations (includes non-hospitality workplace exposure)2.4 (0.97 to 3.83)1.3 (−0.17 to 2.71)1.3 (0.1 to 2.54)0.6 (−0.13 to 1.31)0.08†0.045