Table 1.
Prevalence, Factor Loadings, IRT Parameters and Fit Statistics: Amphetamines
| Amphetamine Abuse (A) and Dependence (D) Criteria |
Prevalence (%) | Model With Legal Problems Criterion | Model Without Legal Problems Criterion | ||||
|---|---|---|---|---|---|---|---|
| Factor Loadings | Discrimination estimate a (SE) | Severity estimate b (SE) | Factor Loadings | Discrimination estimate a (SE) | Severity, estimate b (SE) | ||
| Tolerance (D) | 16.69 | 0.842 | 1.96 (0.06) | 1.36 (0.05) | 0.844 | 1.97 (0.06) | 1.36 (0.05) |
| Withdrawal (D) | 18.00 | 0.887 | 2.01 (0.06) | 1.23 (0.05) | 0.889 | 2.02 (0.06) | 1.23 (0.05) |
| Larger/Longer (D) | 14.74 | 0.897 | 2.00 (0.06) | 1.50 (0.06) | 0.897 | 2.00 (0.06) | 1.50 (0.06) |
| Quit/Control (D) | 38.17 | 0.671 | 1.78 (0.05) | 0.38 (0.04) | 0.672 | 1.79 (0.05) | 0.38 (0.04) |
| Time spent (D) | 16.97 | 0.936 | 2.06 (0.06) | 1.32 (0.05) | 0.935 | 2.06 (0.06) | 1.32 (0.05) |
| Activities given up (D) | 10.80 | 0.881 | 1.98 (0.06) | 1.81 (0.06) | 0.883 | 1.99 (0.06) | 1.81 (0.06) |
| Physical/Psychological problems (D) | 18.11 | 0.891 | 2.00 (0.06) | 1.28 (0.05) | 0.894 | 2.02 (0.06) | 1.27 (0.05) |
| Neglect roles (A) | 12.80 | 0.856 | 1.97 (0.06) | 1.59 (0.06) | 0.851 | 1.96 (0.06) | 1.59 (0.06) |
| Hazardous use (A) | 32.80 | 0.697 | 1.82 (0.05) | 0.63 (0.04) | 0.691 | 1.82 (0.05) | 0.62 (0.04) |
| Social/Interpersonal problems (A) | 25.66 | 0.823 | 1.93 (0.05) | 0.90 (0.05) | 0.821 | 1.93 (0.05) | 0.89 (0.05) |
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| Legal problems (A) | 5.14 | 0.609 | 1.82 (0.05) | 2.39 (0.08) | |||
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| Comparative Fit Index (CFI) | 0.989 | 0.989 | |||||
| Tucker Lewis Index (TLI) | 0.987 | 0.986 | |||||
| Root mean squared error of approximation (RMSEA) | 0.042 | 0.047 | |||||
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| Bayesian Information Criterion (BIC) | 13055.90 | 12478.11 | |||||