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Table 7 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

19) configural

99.01 (38)

.994

.074

   

20) metric

97.80 (46)

.995

.062

19 vs. 20

7.14 (8)

.52

21) scalar

108.12 (59)

.995

.053

20 vs. 21

19.48 (13)

.11

22) strict

119.88 (67)

.995

.052

21 vs. 22

27.24 (8)

< .001

  1. Note. CFI Comparative Fit Index, RMSEA Root Mean Square Error of Approximation