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Table 6 Results of the confirmatory factor analysis

From: Dimensionality of the system usability scale among professionals using internet-based interventions for depression: a confirmatory factor analysis

Model

Npar

Chi square

DF

CFI

TLI

RMSEA (CI)

SRMR

One-factor

50

124.84

35

0.960

0.949

0.103 (0.084–0.123)

0.079

Two-factor

51

82.19

34

0.979

0.972

0.077 (0.056–0.098)

0.066

Tone-model

51

109.88

34

0.966

0.955

0.096 (0.076–0.117)

0.075

Bi-factor

60

44.96

26

0.992

0.985

0.055 (0.026–0.081)

0.042

  1. Npar number of parameters estimated in the CFA, DF degrees of freedom, CFI Comparative Fit Index, TLI Tucker Lewis Index, RMSEA Root Mean Square Error of Approximation, CI 90% confidence interval, SRMR Standardized Root Mean Square Residual