Saliva cotinine concentrations according to self reported current tobacco use
| Saliva cotinine (ng/ml) | Current self reported tobacco use | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Not at all or less than every month | Monthly, less than weekly | Weekly, not daily | Daily | Total | ||||||
| Number | % | Number | % | Number | % | Number | % | Number | % | |
| χ2 p = 0.00. | ||||||||||
| ⩽5 | 395 | 97.8 | 9 | 69.2 | 18 | 51.4 | 3 | 4.5 | 425 | 81.9 |
| >5 | 9 | 2.2 | 4 | 30.8 | 17 | 48.6 | 64 | 95.5 | 94 | 18.1 |
| Total | 404 | 100 | 13 | 100 | 35 | 100 | 67 | 100 | 519 | 100 |