Table 6.
Statistics, loadings, and correlations | Bifactor | Correlated Factors | |||||
---|---|---|---|---|---|---|---|
Statistic | Model fit | Model fit | |||||
Chi-square (WLSMV) | 128.522 | 163.499 | |||||
Degrees of freedom | 54 | 67 | |||||
Comparative fit index | 0.992 | 0.990 | |||||
Tucker-Lewis index | 0.986 | 0.985 | |||||
RMSEA (90% CI) | 0.006 (0.005–0.008) | 0.006 (0.005–0.008) | |||||
Standardized factor loading (SE) | General | Uppers | Downers | All-Arounders | Uppers | Downers | All-Arounders |
Prescription opioids | 0.738 (0.024) | – | 0.562 (0.058) | – | – | 0.888 (0.011) | – |
Sedatives | 0.784 (0.022) | – | 0.400 (0.044) | – | – | 0.917 (0.015) | – |
Heroin | 0.672 (0.037) | – | 0.379 (0.057) | – | – | 0.796 (0.029) | – |
Cannabis | 0.666 (0.021) | – | – | 0.568 (0.160) | – | – | 0.780 (0.015) |
Cocaine/crack | 0.839 (0.021) | 0.100 (0.106) | – | – | 0.845 (0.012) | – | – |
Stimulants | 0.850 (0.025) | 0.097 (0.102) | – | – | 0.845 (0.012) | – | – |
Club drugs | 0.893 (0.029) | – | – | 0.166 (0.093) | – | – | 0.932 (0.016) |
Hallucinogens | 0.920 (0.027) | – | – | 0.178 (0.093) | – | – | 0.961 (0.012) |
Inhalants | 0.873 (0.040) | – | – | 0.095 (0.109) | – | – | 0.898 (0.028) |
Factor correlation (95% CI) | |||||||
Uppers | – | – | – | – | – | .85 (0.81-0.89) | .95 (0.92-0.98) |
Downers | – | – | – | – | – | – | .81 (0.78-0.85) |
Note. Bold font indicates significant factor loading/correlation, p<.001.