Table 3.
Diagnostic accuracy of the interviewer-administered TAPS tool for identifying unhealthy use and substance use disorder (N=2000)
| True Positive (n) | False Negative (n) | True Negative (n) | False Positive (n) | Sensitivity (95% CI) | Specificity (95% CI) | Positive LR (95% CI) | Negative LR (95% CI) | |
|---|---|---|---|---|---|---|---|---|
| Risk Level: Problem use (1 or more items positive on CIDI) | ||||||||
| Tobacco (Cutoff=1) | 599 | 47 | 1174 | 179 | 0.93 (0.90, 0.95) | 0.87 (0.85, 0.89) | 7.01 (6.10, 8.05) | 0.08 (0.06, 0.11) |
| Alcohol (Cutoff=1) | 352 | 122 | 1198 | 327 | 0.74 (0.70, 0.78) | 0.79 (0.76, 0.81) | 3.46 (3.10, 3.86) | 0.33 (0.28, 0.38) |
| Marijuana (Cutoff=1) | 189 | 42 | 1637 | 128 | 0.82 (0.76, 0.87) | 0.93 (0.91, 0.94) | 11.28 (9.45, 13.47) | 0.20 (0.15, 0.26) |
| Cocaine, meth* (Cutoff=1) | 82 | 38 | 1855 | 20 | 0.68 (0.59, 0.77) | 0.99 (0.98, 0.99) | 64.06 (40.74, 100.73) | 0.32 (0.25, 0.42) |
| Heroin (Cutoff=1) | 54 | 15 | 1919 | 6 | 0.78 (0.67, 0.87) | 1.00 (0.99, 1.00) | 251.09 (111.86, 563.60) | 0.22 (0.14, 0.34) |
| Rx opiate† (Cutoff=1) | 42 | 17 | 1908 | 28 | 0.71 (0.58, 0.82) | 0.99 (0.98, 0.99) | 49.22 (32.93, 73.57) | 0.29 (0.20, 0.44) |
| Sedative‡ (Cutoff=1) | 26 | 15 | 1926 | 28 | 0.63 (0.47, 0.78) | 0.99 (0.98, 0.99) | 44.25 (28.64, 68.38) | 0.37 (0.25, 0.56) |
| Risk Level: Substance use disorder (2 or more items positive on CIDI) | ||||||||
| Tobacco (Cutoff=2) | 372 | 134 | 1332 | 161 | 0.74 (0.69, 0.77) | 0.89 (0.88, 0.91) | 6.82 (5.84, 7.96) | 0.30 (0.26, 0.34) |
| Alcohol (Cutoff=2) | 194 | 84 | 1466 | 255 | 0.70 (0.64, 0.75) | 0.85 (0.83, 0.87) | 4.71 (4.11, 5.40) | 0.35 (0.30, 0.42) |
| Marijuana (Cutoff=2) | 105 | 42 | 1764 | 85 | 0.71 (0.63, 0.79) | 0.95 (0.94, 0.96) | 15.54 (12.33, 19.58) | 0.30 (0.23, 0.39) |
| Cocaine, meth* (Cutoff=2) | 61 | 46 | 1873 | 15 | 0.57 (0.47, 0.67) | 0.99 (0.99, 1.00) | 71.76 (42.23, 121.94) | 0.43 (0.35, 0.54) |
| Heroin (Cutoff=2) | 43 | 22 | 1926 | 3 | 0.66 (0.53, 0.77) | 1.00 (1.00, 1.00) | 425.37 (135.50, 1335.39) | 0.34 (0.24, 0.48) |
| Rx opiate† (Cutoff=2) | 23 | 25 | 1941 | 6 | 0.48 (0.33, 0.63) | 1.00 (0.99, 1.00) | 155.49 (66.35, 364.39) | 0.52 (0.40, 0.69) |
| Sedative‡ (Cutoff=2) | 15 | 13 | 1947 | 20 | 0.54 (0.34, 0.72) | 0.99 (0.98, 0.99) | 52.69 (30.22, 91.86) | 0.47 (0.32, 0.70) |
Notes to Table 3. CI = Confidence Interval; LR=Likelihood Ratio; CIDI = Composite International Diagnostic Interview Composite Index; TAPS = Tobacco, Alcohol, Prescription medication, and other Substance use
There were 5 participants who did not complete the entire CIDI, and one participant who did not complete the entire interviewer-administered TAPS Tool. Therefore, when the score for CIDI or TAPS Tool is missing for a given drug, these cases were excluded from the analyses.
Described in TAPS as ‘Cocaine (crack) or methamphetamine’
Described in TAPS as ‘Prescription opiate pain reliever’
Described in TAPS as ‘Medication for anxiety or sleep’