Table 3.
Concordance of Time 1 and Time 2 results for classification of low risk versus moderate-high risk use (N=101).
| Individuals in risk
category N (%) |
Concordant risk levela N (%) |
Increased risk levelb N |
Decreased risk levelc N |
McNemar’s test P-valued | Kappae | ||
|---|---|---|---|---|---|---|---|
|
| |||||||
| Substance Use Variable | Time 1 | Time 2 | |||||
|
| |||||||
| Tobacco | 94 (93.1) | 5 | 2 | 0.453 | 0.850 | ||
| Low risk | 66 (65.3) | 63 (62.4) | |||||
| Mod OR high risk | 35 (34.7) | 38 (37.6) | |||||
|
| |||||||
| Alcohol | 95 (94.1) | 2 | 4 | 0.687 | 0.836 | ||
| Low risk | 76 (75.2) | 78 (77.2) | |||||
| Mod OR high risk | 25 (24.8) | 23 (22.8) | |||||
|
| |||||||
| Drugs (summary category)f | 94 (93.1) | 2 | 5 | 0.453 | 0.861 | ||
| Low risk | 53 (52.5) | 56 (55.4) | |||||
| Mod OR high risk | 48 (47.5) | 45 (44.6) | |||||
|
| |||||||
| Marijuana | 92 (91.1) | 6 | 3 | 0.508 | 0.764 | ||
| Low risk | 77 (76.2) | 74 (73.3) | |||||
| Mod OR high risk | 24 (23.8) | 27 (26.7) | |||||
|
| |||||||
| Cocaine | 95 (94.1) | 4 | 2 | 0.687 | 0.855 | ||
| Low risk | 73 (72.3) | 71 (70.3) | |||||
| Mod OR high risk | 28 (27.7) | 30 (29.7) | |||||
|
| |||||||
| Prescription opioids | 92 (91.1) | 4 | 5 | 1.000 | -- | ||
| Low risk | 85 (84.2) | 86 (85.1) | |||||
| Mod OR high risk | 16 (15.8) | 15 (14.9) | |||||
|
| |||||||
| Sedatives | 91 (90.1) | 4 | 6 | 0.754 | -- | ||
| Low risk | 88 (87.1) | 90 (89.1) | |||||
| Mod OR high risk | 13 (12.9) | 11 (10.9) | |||||
|
| |||||||
| Hallucinogens | 96 (95.0) | 0 | 5 | 0.063 | -- | ||
| Low risk | 91 (90.1) | 96 (95.0) | |||||
| Mod OR high risk | 10 (9.9) | 5 (5.0) | |||||
|
| |||||||
| Heroin | 96 (95.0) | 1 | 4 | 0.375 | -- | ||
| Low risk | 84 (83.2) | 87 (86.1) | |||||
| Mod OR high risk | 17 (16.8) | 14 (13.9) | |||||
|
| |||||||
| Prescription stimulants | 99 (98.0) | 1 | 1 | 1.000 | -- | ||
| Low risk | 97 (96.0) | 97 (96.0) | |||||
| Mod OR high risk | 4 (4.0) | 4 (4.0) | |||||
|
| |||||||
| Inhalants | 96 (95.0) | 2 | 3 | 1.000 | -- | ||
| Low risk | 96 (95.0) | 97 (96.0) | |||||
| Mod OR high risk | 5 (5.0) | 4 (4.0) | |||||
|
| |||||||
| Methamphetamine | 97 (96.0) | 3 | 1 | 0.625 | -- | ||
| Low risk | 96 (95.0) | 94 (93.1) | |||||
| Mod OR high risk | 5 (5.0) | 7 (6.9) | |||||
|
| |||||||
| Other Drug | 95 (94.1) | 2 | 4 | 0.687 | -- | ||
| Low risk | 94 (93.1) | 96 (95.0) | |||||
| Mod OR high risk | 7 (6.9) | 5 (5.0) | |||||
Concordant risk level = remained in same risk level between T1 and T2
Increased risk level = went from low to moderate-high risk
Decreased risk level = went from moderate-high to low risk
P-value for McNemar’s test of correlated proportions, comparing the proportion of individuals having low risk versus moderate-high risk scores at T1 and T2. A non-significant P-value implies that there was no significant change in scores for the study population between T1 and T2.
Cohen’s Kappa was calculated for all substances having 20% or greater prevalence of moderate-high risk use in the study population. All kappa values shown were statistically significant at the P<.001 level.
Risk level is based on highest risk score for any substance in this category