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Table 1 The reference, initial and modified fitting index values of the four-factor model

From: A scale for measuring home-based cardiac rehabilitation exercise adherence: a development and validation study

Fitting indexs

Reference value

Initial value

Modified value

Chi-square degree of freedom (χ2/df)

≤ 3.00

3.215

1.420

Root mean square error of approximation (RMSEA)

≤ 0.05

0.090

0.043

Goodness-of-fit index (GFI)

≥ 0.90

0.821

0.912

Adjusted goodness-of-fit index (AGFI)

≥ 0.90

0.771

0.885

Tucker lewis index (TLI)

≥ 0.90

0.880

0.977

Comparative fit index (CFI)

≥ 0.90

0.896

0.981

Incremental fit index (IFI)

≥ 0.90

0.897

0.981

Parsimonious goodness-of-fit index (PGFI)

≥ 0.70

0.641

0.703

Parsimonious normed-of-fit index (PNFI)

≥ 0.70

0.740

0.799