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Table 5 Invariance Testing Across Time for the Two-Factor Model of the PHQ-8 in the Control 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

 9) configural

321.06 (213)

.958

.041

   

 10) metric

344.08 (227)

.955

.042

9 vs. 10

27.98 (14)

.01

Without baseline

 11) configural

172.10 (90)

.963

.062

   

 12) metric

175.39 (96)

.964

.059

11 vs. 12

3.71 (6)

.72

 13) scalar

182.55 (110)

.967

.053

12 vs. 13

10.53 (14)

.72

 14) strict

178.74 (120)

.973

.045

13 vs. 14

9.06 (10)

.53

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