Table 3

Ratios (95% CI) of geometric mean of air nicotine concentration by bar/restaurant characteristics

Bar/restaurant characteristicNo. of venuesNo. of samplesGeometric mean (95% CI)Crude ratio (95% CI)Adjusted ratio (95% CI)
Smoking status of the venue*
Smoke free350.18 (0.08 to 0.41)1.0 (reference)1.0 (reference)
Mixed: smoke-free area17170.60 (0.28 to 1.29)3.31 (0.75 to 14.68)3.24 (0.70 to 15.01)
Mixed: smoking area17176.45 (2.61 to 15.92)36.3 (8.19 to 161.0)35.5 (7.56 to 164.6)
Smoking101610.47 (7.29 to 15.02)58.9 (13.3 to 261.1)56.2 (12.1 to 260.9)
Type of venue*
Restaurant12230.97 (0.37 to 2.52)1.0 (reference)1.0 (reference)
Bar/pub18325.24 (3.19 to 8.62)5.25 (1.86 to 14.8)6.17 (2.18 to 17.4)
Customers smoking inside (%)*
Nobody230.09 (0.06 to 0.14)1.0 (reference)1.0 (reference)
<50% of the customers13221.44 (0.64 to 3.25)15.9 (1.90 to 132.2)5.49 (0.37 to 82.4)
>50% of the customers15306.60 (4.02 to 10.85)72.4 (8.69 to 604.2)10.7 (0.60 to 192.5)
Windows facing outdoors*
No9161.99 (0.80 to 4.92)1.0 (reference)1.0 (reference)
Yes21392.81 (1.43 to 5.54)1.45 (0.53 to 4.89)0.95 (0.39 to 2.36)
Ventilation system §
No248.51 (2.88 to 25.14)1.0 (reference)1.0 (reference)
Yes28512.34 (1.36 to 4.02)0.27 (0.03 to 2.24)1.26 (0.23 to 6.99)
Air conditioning
No12225.12 (2.85 to 9.22)1.0 (reference)1.0 (reference)
Yes18331.62 (0.75 to 3.49)0.31 (0.10 to 0.91)0.69 (0.29 to 1.63)
Volume
<289 m315272.51 (1.11 to 5.66)1.0 (reference)1.0 (reference)
>289 m315282.57 (1.24 to 5.29)1.02 (0.33 to 3.15)0.95 (0.40 to 2.25)
  • * Adjusted for volume of the venue, smoking status of the venue and ventilation.

  • Adjusted for volume of the venue and smoking status of the venue.

  • Adjusted for ventilation of the venue and smoking status of the venue.

  • § Included air extractor and ventilator.