Table 2.
Concordance of self-report and toxicology assays for THC and cotinine.
| YLWH N = 78 | Uninfected N = 55 | |||||
|---|---|---|---|---|---|---|
| Cannabis | ||||||
| Reported NO | Tested positive | Concordance | Reported NO | Tested positive | Concordance | |
| 40 | 3 | 93% | 26 | 1 | 96% | |
| Reported YES | Tested positive | Concordance | Reported YES | Tested positive | Concordance | |
| 38 | 25 | 29 | 14 | |||
| Daily | 16 | 16 | 100% | 6 | 6 | 100% |
| Weekly | 7 | 6 | 86% | 5 | 5 | 100% |
| Monthly | 2 | 0 | 0% | 3 | 1 | 33% |
| Once/twice | 13 | 3 | 23% | 15 | 2 | 13% |
| Overall κ = 0.587, p = 0.432 | ||||||
| Tobacco products | ||||||
| Reported no. | Tested positive | Concordance | Reported no. | Tested positive | Concordance | |
| 34 | 6 | 82% | 35 | 1 | 97% | |
| Reported yes | Tested positive | Concordance | Reported yes | Tested positive | Concordance | |
| 44 | 34 | 20 | 12 | |||
| Daily | 22 | 22 | 100% | 8 | 8 | 100% |
| Weekly | 7 | 5 | 71% | 2 | 2 | 100% |
| Monthly | 5 | 3 | 60% | 0 | 0 | – |
| Once/twice | 10 | 4 | 40% | 10 | 2 | 20% |
Overall κ = 0.588, p = 0.618.