Table 3 |
||||
|
Heroin and cocaine self-reported use compared to hair sample test results |
||||
|
Biological sample |
||||
|
|
||||
|
Heroin |
Cocaine |
|||
|
|
||||
|
Self-reported drug use in the last 30 days |
Positive |
Negative |
Positive |
Negative |
|
|
||||
|
yes |
14 |
2 |
9 |
0 |
|
no |
4 |
11 |
12 |
10 |
|
|
||||
|
Total agreement |
80.7% |
61.3% |
||
|
Sensitivity |
77.8% |
42.9% |
||
|
Specificity |
84.6% |
100% |
||
|
|
||||
|
Vigna-Taglianti et al. Substance Abuse Treatment, Prevention, and Policy 2007 2:9 doi:10.1186/1747-597X-2-9 |
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