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| Amphetamines | ||||
|---|---|---|---|---|
| Self-reported either XTC, amp, or CMA in the past 24 hours | Total | |||
| no | yes | |||
| DrugWipe 5+: Amphetamine | Positive | 11 | 4 | 15 |
| Negative | 834 | 3 | 837 | |
| Total | 845 | 7 | 852 | |
Assuming self-reports as the gold standard, sensitivity = 57.1%, specificity = 98.7%
Expected number reporting use and testing negative = 4 * .15 = 1
Expected number reporting no use and testing positive = 834*.03 = 25
