Mean carboxyhaemoglobin percentage for current cigarette smokers according to whether they inhale (1709 men and 1863 women)
| Smoking (cigarettes/day) | All | Men | Women | |||
|---|---|---|---|---|---|---|
| No | Mean (SD) | No | Mean (SD) | No | Mean (SD) | |
| p Value for difference in means. | ||||||
| 1–5 | ||||||
| Inhale | 87 | 2.46 (2.10) | 26 | 2.43 (1.69) | 61 | 2.48 (2.26) |
| Not inhale | 67 | 2.07 (1.65) | 9 | 1.64 (1.15) | 58 | 2.13 (1.71) |
| p Value | 0.20 | 0.21 | 0.35 | |||
| 6–14 | ||||||
| Inhale | 767 | 4.67 (2.42) | 303 | 4.40 (2.28) | 464 | 4.84 (2.49) |
| Not inhale | 180 | 3.96 (2.46) | 38 | 3.30 (1.77) | 142 | 4.13 (2.59) |
| p Value | <0.0001 | 0.004 | 0.004 | |||
| 15–24 | ||||||
| Inhale | 1670 | 5.98 (2.53) | 815 | 5.75 (2.53) | 855 | 6.21 (2.51) |
| Not inhale | 174 | 4.56 (2.39) | 48 | 4.38 (2.34) | 126 | 4.63 (2.41) |
| p Value | <0.0001 | <0.0001 | <0.0001 | |||
| ⩾25 | ||||||
| Inhale | 583 | 6.63 (2.58) | 445 | 6.59 (2.53) | 138 | 6.77 (2.74) |
| Not inhale | 44 | 5.25 (2.20) | 25 | 5.0 (2.30) | 19 | 5.56 (2.08) |
| p Value | 0.001 | 0.002 | 0.07 | |||