Table 1

Differences in smoke topography by location of use and by sex, mean (95% CI)

TopographyLocationSexFrequency of use
Home (n=75)Café (n=4)P values*Female (n=38)Male (n=41)P values*DailyWeeklyP values*
Total smoking time, minutes47.2 (45.1 to 49.4)41.3 (38.0 to 44.6)0.21647.2 (44.2 to 50.3)46.6 (43.7 to 49.6)0.79747.0 (44.3 to 49.8)47.3 (44.1 to 50.6)0.887
Total no of puffs293 (267 to 318)251 (105 to 397)0.455310 (269 to 350)273 (244 to 301)0.133295 (269 to 321)288 (242 to 335)0.799
Total puffing time, minutes15.6 (12.4 to 18.7)10.0 (4.8 to 15.3)0.42713.9 (12.6 to 15.2)16.6 (10.8 to 22.3)0.38617.0 (11.6 to 22.4)13.4 (12.0 to 14.9)0.244
Total inhaled volume, litres217 (198 to 235)176 (96 to 256)0.324218.1 (192 to 244)211 (186 to 236)0.696221 (197 to 244)211 (183 to 238)0.583
Single puff volume, litres0.79 (0.73 to 0.86)0.75 (0.37 to 1.14)0.7860.74 (0.66 to 0.82)0.84 (0.74 to 0.94)0.1250.79 (0.70 to 0.88)0.81 (0.71 to 0.91)0.785
Single puff duration, seconds2.9 (2.7 to 3.1)2.5 (1.0 to 4.0)0.3992.8 (2.5 to 3.0)3.0 (2.7 to 3.4)0.1962.9 (2.6 to 3.2)2.98 (2.67 to 3.30)0.588
Interpuff interval, seconds7.5 (6.8 to 8.2)8.8 (1.7 to 15.8)0.4417.1 (6.3 to 8.0)8.0 (6.9 to 9.1)0.2037.2 (6.3 to 8.0)8.14 (6.95 to 9.32)0.168
  • *Independent samples t-test.