It was also higher than our cutoff of 0.7 but not in high 0.9's suggesting the items are tapping into a central construct (i.e. quality of life) without indicating some items are redundant.
However, very high internal consistency reliability (Cronbach's alpha = 0.96, N = 152), probably indicated some item redundancy in the 22-item GWBI.
In addition, item 17, which was retained in our study (although indicating some differential item functioning for age and gender), was removed in the Cole et al' [ 13] study.
PSI was 0.50, which indicates rather low internal consistency, and there were negative residual correlations below -0.3 between three of the items indicating some remaining multidimensionality.
The minimum values for person ability exceeded the minimum values for item difficulty, indicating that some items were excessively easy, namely items FN1LC, FN2LC, FN7IC, BE1LC and KS3LC.
The minimum values for person ability exceeded the minimum values for item difficulty, indicating that some items were excessively easy, such as the following items: FN1LC, FN2LC, FN7IC, BE1LC, KS1R, KS3LC.
Finally, there were inter-item correlations less than 0.3, indicating that some items do not measure the underlying construct [ 38, 45].
We found a wide range of ICC values, indicating that some items captured a greater proportion of daily dynamics relative to stable, between-person differences, than others.
The model fit may have room for improvement as 10.5% of residuals are outside of the preferred limits potentially indicating that some items may not fit well within the proposed structure.
The C-PRS was marginally more difficult for our sample of parents to complete than the MORS (Child), with some parents indicating that some items were worded in a way which was not as simple as could be and that some items did not apply as the child was not old enough.
