Table 1.
Prevalence of Substance Use by Reporter and Agreement Indices
| Substance | N Adolescent Yes (%) |
N Collateral Yes (%) |
Listwise N |
Kappa | Phi Coefficient |
McNemar’s Test |
Sens. | Spec. | PPV | NPV | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Alcohol | 1550 | (31%) | 500 | (10%) | 4946 | .296* | .368* | < .001 | .27 | .97 | .81 | .75 |
| Marijuana | 631 | (13%) | 227 | (5%) | 4931 | .414* | .476* | < .001 | .31 | .99 | .84 | .91 |
| Cocaine | 34 | (1%) | 4 | (0.1%) | 4956 | .056* | .088* | < .001 | .03 | .99 | .25 | .99 |
| Inhalants | 238 | (5%) | 4 | (0.1%) | 4935 | .007+ | .028+ | < .001 | .004 | .99 | .25 | .95 |
| Stimulants | 105 | (2%) | 17 | (0.3%) | 4955 | .117* | .170* | < .001 | .07 | .99 | .44 | .98 |
Notes.
*
p < .001.
+
p = .053.
Sens. = sensitivity. Spec. = specificity. PPV = positive predictive value. NPV = negative predictive value.