Prevalence and intensity of directly measured SHS exposure among non-smoking adults with asthma during the previous 3 months: hair analysis
| Hair measurement† | Prevalence | Nicotine concentration among those with any exposure (ng/mg hair) | ||
|---|---|---|---|---|
| Minimum | Median | Maximum | ||
| †First 1 cm of hair corresponds approximately to exposure during the previous month; 2–3 cm of hair corresponds approximately to exposure during the previous 2–3 months. | ||||
| p>0.50 in all cases for comparison of prevalence in ICU v hospital only group (likelihood ratio χ2 test). | ||||
| Nicotine | ||||
| Previous month | ||||
| ICU (n = 20) | 11 (55%) | 0.06 | 0.28 | 1.41 |
| Hospital only (n = 118) | 72 (61%) | 0.03 | 0.15 | 3.15 |
| Total (n = 138) | 83 (60%) | 0.03 | 0.16 | 3.15 |
| Previous 2–3 months | ||||
| ICU (n = 19) | 12 (63%) | 0.07 | 0.21 | 1.45 |
| Hospital only (n = 105) | 74 (70%) | 0.02 | 0.17 | 4.00 |
| Total (n = 124) | 86 (69%) | 0.02 | 0.18 | 4.00 |
| Cotinine | ||||
| Previous month | ||||
| ICU (n = 20) | 15 (75%) | 0.02 | 0.10 | 0.50 |
| Hospital only (n = 118) | 88 (75%) | 0.01 | 0.085 | 0.78 |
| Total (n = 138) | 103 (75%) | 0.01 | 0.09 | 0.78 |
| Previous 2–3 months | ||||
| ICU (n = 19) | 15 (79%) | 0.02 | 0.09 | 0.61 |
| Hospital only (n = 105) | 88 (84%) | 0.02 | 0.09 | 1.11 |
| Total (n = 124) | 103 (83%) | 0.02 | 0.09 | 1.11 |