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Table 4 Confirmatory factor analysis fits for the three DASS-21 subscales (n = 1135)

From: Psychometric properties of the Persian version of Depression Anxiety Stress Scale-21 Items (DASS-21) in a sample of health professionals: a cross-sectional study

Index

Index Criteria

(n > 250)

Fit Index in Iranian Sample

(n = 1135)

χ2 (df), p-value

p < 0.05

1457 (186), p < 0.001

Normed chi-square (χ2/df)

< 3

7.835

RMSEA (CI)

≤0.08

0.078

TLI

> 0.90

0.906

CFI

> 0.90

0.917

NFI

> 0.90

0.906

GFI

> 0.85

0.876

AGFI

> 0.85

0.847

SRMR

≤0.08

0.047

  1. RMSEA Root mean square error of approximation, CI confidence interval, TLI Tucker-Lewis index, CFI Comparative fit index, NFI Normed fit index, GFI Goodness-of-fit index, AGFI Adjusted goodness-of-fit index, SRMR Standardized root mean square residual