Table 6 Goodness-of-fit index model for Donors (Group A) and Non-donors (Group B)

Χ² (Chi-squared)

934.259*

[55, 58,59,60]

degrees of freedom

760

p-value

0.000

Χ² (Chi-squared) contribution group A

481.191

[67]

Χ² (Chi-squared) contribution group B

453.068

SRMR (Standardized root mean square residual)

0.074

< 0.08 [60]

CFI (Comparative fit index)

0.907

≥ 0.90 [57]

TLI (Tucker-Lewis index)

0.901

≥ 0.90 [58]

RMSEA

<  0.05: minimal error

Root mean square error of approximation

0.042

0.05 ≤ RMSEA ≤0.08 acceptable

90% C.I. = (0.032–0.051)

≥ 0.08 rejectable model [56]

WRMR (Weighted root mean square residual)

0.985

<  1 [69]