Table 4 Invariance Testing Across Time for the Two-Factor Model of the PHQ-8 in the Intervention Group
From: Longitudinal measurement invariance of the patient health questionnaire in a German sample
Model | χ2(df) | CFI | RMSEA | Model comparison | Δχ2(df) | p |
|---|---|---|---|---|---|---|
All assessments | ||||||
 3) configural | 794.54 (615) | .969 | .032 |  |  |  |
 4) metric | 835.68 (647) | .967 | .032 | 3 vs. 4 | 50.18 (32) | .02 |
Without baseline | ||||||
 5) configural | 509. 5 (388) | .977 | .035 |  |  |  |
 6) metric | 528.3 (406) | .977 | .034 | 5 vs. 6 | 19.47 (18) | .36 |
 7) scalar | 566.82 (448) | .977 | .032 | 6 vs. 7 | 41.2 (42) | .51 |
 8) strict | 599.43 (478) | .977 | .031 | 7 vs. 8 | 42.82 (30) | .06 |