Table 6 Invariance Testing for the Two-Factor Model of the PHQ-8 Across 6 & 12 Months and Between Groups
From: Longitudinal measurement invariance of the patient health questionnaire in a German sample
Model | χ2(df) | CFI | RMSEA | Model comparison | Δχ2(df) | p |
|---|---|---|---|---|---|---|
15) configural | 291.79 (180) | .976 | .051 | Â | Â | Â |
16) metric | 316.04 (214) | .979 | .045 | 15 vs. 16 | 36.95 (34) | .33 |
17) scalar | 353.03 (256) | .980 | .040 | 16 vs. 17 | 47.95 (42) | .24 |
18) strict | 370.13 (272) | .979 | .039 | 17 vs. 18 | 24.35 (16) | .08 |