Table 2. The results of Kaiser-Meyer-Olkin and Bartlett’s tests
Furthermore, the results obtained from the confirmatory factor analysis
according to the fit indicators helped confirm the 4-factor construct of
the Persian version of the questionnaire in this study.
The results of analytical fitted statistics reported a good estimate
based on the general indicators of the fitted model: chi-square value of
4184.26 (p = 0.000) with a degree of freedom (df) of 1478 and a ratio of
2.83. Given that the significance of the chi-square value can be
attributed to the sample size and the robustness, the fitted model
statistics suggest that this pattern has provided the best fit for the
data because all the statistical values are desirable; in other words,
x2/df = 2.23 (which is below 3), GFI = 0.67 and AGFI =
0.64 (which are within the acceptable range of 0 to 1), RMR = 0.11 and
SRMR = 0.078 (which are small and near 0), RMSEA = 0.078 (which is
within the acceptable range of 0.06 to 0.08), and NFI = 0.95, NNFI =
0.97 and CFI = 0.97 (which are greater than or equal to 0.95).
Pearson correlation coefficient which was obtained from the test-retest
statistical method was also calculated at this stage to determine the
reliability of the instrument and the intra-class correlation value was
reported to be 0.95 (p <0.05). Also, the internal consistency
(based on Cronbach’s alpha coefficient) of this instrument was
calculated to be 0.97.