Table 2.
Sample characteristics and smoking topography of Japanese smokers
| Characteristic | Total (n = 101)a | Ultra-low (n = 14) | Low (n = 38)a | Medium (n = 27) | High (n = 22) |
|---|---|---|---|---|---|
| Male/female | 88/13 | 10/4 | 33/5 | 24/3 | 21/1 |
| Age (years) | 40.0 ± 11.0 | 39.2 ± 10.2 | 40.1 ± 12.6 | 41.9 ± 11.2 | 38.0 ± 8.4 |
| Cigarette consumption (cigarette/day) | 18.4 ± 7.5 | 18.7 ± 8.3 | 17.8 ± 7.2 | 18.2 ± 6.6 | 19.3 ± 8.8 |
| Body mass index | 23.2 ± 3.8 | 22.2 ± 2.6 | 22.8 ± 3.0 | 23.9 ± 4.6 | 23.7 ± 4.5 |
| Self-reported smoking intensity | 57.8 ± 17.0 | 56.1 ± 17.3 | 57.0 ± 15.5 | 53.6 ± 15.6 | 65.5 ± 19.5 |
| Time to first smoking cigarette (%) | |||||
| 0–5 min | 23.8 % | 21.4 % | 23.7 % | 29.6 % | 18.2 % |
| 6–30 min | 44.6 % | 50.0 % | 36.8 % | 40.7 % | 59.1 % |
| 31–60 min | 18.8 % | 0.0 % | 26.3 % | 22.2 % | 13.6 % |
| ≥61 min | 12.9 % | 28.6 % | 13.2 % | 7.4 % | 9.1 % |
| Puff volume (mL) | 54.3 ± 14.1 | 64.6 ± 12.3 | 56.0 ± 12.2 | 46.9 ± 12.3 | 53.8 ± 15.8 |
| Puff volume/cigarette (mL) | 767.2 ± 259.5 | 1160.1 ± 302.7 | 810.0 ± 179.6 | 609.4 ± 158.7 | 638.7 ± 136.9 |
| Puff number/cigarette | 14.5 ± 3.6 | 17.9 ± 3.2 | 15.0 ± 3.1 | 13.4 ± 3.4 | 12.6 ± 3.1 |
| Puff volume/day (mL) | 14,456.2 ± 8,769.0 | 22,579.9 ± 15,557.4 | 14,423.2 ± 7,249.8 | 11,435.1 ± 5,232.0 | 13,049.7 ± 5,556.8 |
Data are presented as the mean ± standard deviation (SD), unless indicated otherwise
aTopographic data were not available for one smoker who smoked low nicotine-yield cigarettes, and there were therefore 100 and 37 smokers in the “Total” and “Low” experimental smoking groups, respectively