Mean physical characteristics of Chinese brands tested in both 2005–6 and 2007
| Independent samples | Repeat samples (n=15) | |||
| Mean (SE) | Mean (SE) | |||
| 2005–6 (n=50) | 2007 (n=13) | 2005–6 | 2007 | |
| Labelled tar (mg/cigarette) | 13.9 (0.31) | 12.9* (0.57) | 13.5 (0.5) | 12.9‡ (0.5) |
| Labelled nicotine (mg/cigarette) | 1.13 (0.02) | 1.12 (0.04) | 1.07 (0.04) | 1.08 (0.04) |
| Labelled CO‡ (mg/cigarette) | 13.4 (0.55) | 13.8 (0.55) | 12.9 (0.5) | 12.9 (0.4) |
| Cigarette length (mm) | 83.8 (0.02) | 83.7 (0.04) | 83.6 (0.06) | 83.9‡ (0.03) |
| Rod diameter (mm) | 7.6 (0.02) | 7.6 (0.03) | 7.6 (0.05) | 7.6 (0.03) |
| Tipping paper length (mm) | 29.4 (0.40) | 28.5 (0.58) | 28.2 (0.65) | 28.4 (0.67) |
| Tobacco rod length (mm) | 61.4 (0.40) | 62.3 (0.62) | 61.4 (0.66) | 62.4‡ (0.63) |
| Filter length (mm) | 22.0 (0.54) | 20.2* (1.1) | 22.0 (0.64) | 21.8 (0.67) |
| Filter weight (mg) | 115.8 (2.68) | 107.3 (6.2) | 114.6 (4.7) | 114.6 (3.1) |
| Paper permeability (CORESTA units) | 52.7 (1.40) | 52.3 (1.88) | 49.5 (0.70) | 52.9 (0.90) |
| Pressure drop (mmwg) | 107.0 (1.61) | 115.9*(2.74) | 119.0 (3.2) | 112.9 (2.6) |
| Ventilation (%) | 7.3 (1.67) | 4.9 (2.74) | 5.9 (2.0) | 4.6 (1.8) |
| Tobacco weight (mg) | 684.2 (5.57) | 675.2 (9.19) | 680.0 (7.9) | 687.1 (8.4) |
| Filter density (mg/ml) | 113.9 (0.84) | 116.3 (1.01) | 113.1 (1.19) | 113.7 (1.10) |
| Rod density (mg/ml) | 244.6 (1.62) | 239.2 (4.03) | 239.1 (2.14) | 242.0†(2.32) |
| Moisture (%) | 19.1 (0.16) | 18.3 (0.45) | 19.0 (0.21) | 18.3‡ (0.30) |