Table 2.
Fit statistics for study models.
| Models | χ2 | df | CFI | RMSEA [90% CI] | WRMR |
|---|---|---|---|---|---|
| Pretreatment
analyses | |||||
| Measurement Models | |||||
| Model 1: Correlated Symptom Clusters (PCL-5) | 587.69 | 165 | 0.88 | .099 [.090-.108] | 1.42 |
| Model 2: Bifactor Model (PCL-5) | 380.34* | 151 | 0.94 | .076 [.067-.086] | 1.06 |
| Model 3: Unidimensional Model (BDI-II) | 498.90 | 186 | 0.94 | .079 [.071-.088] | 1.19 |
| Structural Models | |||||
| Model 4: Correlated Symptom Clusters (PCL-5)/Unidimensional (BDI-II) | 1608.08 | 767 | 0.91 | .064 [.060-.068] | 1.37 |
| Model 5: Bifactor Model (PCL-5)/Unidimensional (BDI-II) | 1383.88* | 752 | 0.93 | .056 [.051-.061] | 1.21 |
| Posttreatment
analyses | |||||
| Measurement Models | |||||
| Model 1: Correlated Symptom Clusters (PCL-5) | 355.19 | 165 | 0.97 | .085 [.073-.098] | 0.92 |
| Model 2: Bifactor Model (PCL-5) | 268.63* | 151 | 0.99 | .070 [.056-.084] | 0.74 |
| Model 3: Unidimensional Model (BDI-II) | 393.04 | 180 | 0.98 | .083 [.072-.095] | 0.99 |
| Structural Models | |||||
| Model 4: Correlated Symptom Clusters (PCL-5)/Unidimensional (BDI-II) | 1227.11 | 761 | 0.97 | .060 [.054-.066] | 1.06 |
| Model 5: Bifactor Model (PCL-5)/Unidimensional (BDI-II) | 1154.99* | 746 | 0.97 | .057 [.050-.063] | 0.99 |
Note. df = degrees or freedom; CFI = comparative fit index; RMSEA = root mean square error or approximation; CI = confidence interval; WRMR = weighted root mean square residual; PCL-5 = PTSD Checklist for DSM-5; BDI-II = Beck Depression Inventory-II.
*
Statistically different (p < .001) from previous model.