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Table 3 Partial confirmatory factor analysis for the DASS-21

From: Factor structure of the depression anxiety stress Scale-21 (DASS-21): Unidimensionality of the Arabic version among Egyptian drug users

Factors

Null χ2

Null df

Implied χ2

Implied df

NFI

CFI

TLI

RMSEA

Two

973.5

210

247.6

169

0.75

0.90

0.87

0.06

Three

973.5

210

199.1

150

0.80

0.94

0.91

0.05

Four

973.5

210

155.2

132

0.84

0.97

0.95

0.03

  1. Null χ2 and null df come from Bartlett’s test of sphericity, implied χ2 and implied df come from the Goodness-of-Fit test. NFI Normed fit index, CFI Comparative fit index, TLI Tucker-Lewis index, RMSEA Root mean square error of approximation