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Table 2 Fit Statistics for the Correlated Two-Factor Model and Tests of Invariance for the GAD-7 and PHQ-9 Items

From: Measurement invariance of the Patient Health Questionnaire (PHQ-9) and Generalized Anxiety Disorder scale (GAD-7) across four European countries during the COVID-19 pandemic

Model

χ 2

df

p

CFI

TLI

RMSEA

SRMR

CFA

       

UK

1,019.749

103

< 0.001

0.933

0.921

0.066

(0.063, 0.070)

0.042

Ireland

580.696

103

< 0.001

0.930

0.918

0.067

(0.062, 0.072)

0.043

Spain

1,079.059

103

< 0.001

0.928

0.916

0.070

(0.066, 0.074)

0.041

Italy

495.612

103

< 0.001

0.949

0.941

0.061

(0.055, 0.066)

0.034

Invariance

       

Configural

3,187.083

412

< 0.001

0.933

0.922

0.067

(0.065, 0.069)

0.040

Metric

3,639.737

454

< 0.001

0.924

0.919

0.068

(0.066, 0.070)

0.057

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BMC Psychiatry

ISSN: 1471-244X

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