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Table 2 Effects of characteristics of waterpipe smokers and duration of smoking on rise in exhaled carbon monoxide concentration
| Characteristic | N (%) | Unadjusted coefficient (95%CI) for ppm rise in CO | Adjusted2 coefficient (95%CI) for ppm rise in CO |
|---|---|---|---|
| Duration of session | 29.6 (10.1)1 | 15.8 (11.0–20.6)3 | 14.8 (9.3–20.3)3 |
| Age of participant in years | 22.8 (4.3)1 | 1.8 (0.4–3.2)4 | -0.1 (-1.4–1.2)4 |
| Ethnic group | |||
| White and others | 43 (68.3) | Reference | Reference |
| Asian | 28 (44.4) | -15.5 (-29.4–1.7) | -5.6 (-18.4–7.2) |
| Arab | 15 (23.8) | 3.7 (-12.5–19.9) | -1.9 (-15.3–11.5) |
| Gender | |||
| Male | 49 (77.8) | 15.9 (5.1–26.6) | 6.4 (-6.9–19.6) |
| Female | 14 (22.2) | Reference | Reference |
