Chapter 3 44 Table 3 Factor loadings, Eigenvalues, percentage of explained variance and McDonald’s omega for the two factors of the RAdMAT-NL (n = 193) Items Factor loadings Item Factor 1 Participation Factor 2 Communication 1. Attends scheduled rehabilitation sessions 0.61 -0.10 2. Arrives at rehabilitation on time 0.46 -0.22 3. Follows the physiotherapists instructions during rehabilitation sessions 0.63 -0.03 4. Follows the prescribed rehabilitation plan 0.76 -0.07 5. Completes all tasks assigned by the physiotherapist 0.71 -0.05 6. Asks questions about his rehabilitation 0.44 0.66 7. Communicates with the physiotherapist if there is a problem with the exercises 0.38 0.46 8. Provides the physiotherapist feedback about the rehabilitation program 0.42 0.60 9. Has a positive attitude during rehabilitation sessions 0.76 -0.15 10. Has a positive attitude toward the rehabilitation process 0.80 -0.14 11. Gives 100% effort in rehabilitation sessions 0.72 -0.03 12. Is self-motivated in rehabilitation sessions 0.79 -0.15 13. Is an active participant in the rehabilitation process 0.75 -0.08 14. Stays focused while doing rehabilitation exercises 0.49 -0.26 15. Is motivated to complete rehabilitation 0.81 -0.12 16. Shows interest in the rehabilitation process 0.72 0.30 Eigenvalues 6.97 1.17 % of variance 44% 7% McDonald’s omega 0.92 0.68 Note: items with loadings highlighted in bold are retained in the RAdMAT-NL The unidimensionality of the RAdMAT-NL was tested using the dichotomous Rasch model. The ICC plots of the 16 items showed a less good fit to the unidimensional model for the items 6, 7 and 8. Mean square infit and outfit statistics showed higher values (> 1.5) for the items 6, 7 and 8, indicating the scores on these items deviate from what is expected by the model (Table 4). The Andersen LR-test had a p-value < 0.001, indicating that the unidimensional Rasch model has been rejected for this itemset. Repeating the tests for the 13 items of Participation showed that item 14 had a mean square infit and outfit statistic of 1.670 and the Andersen LR-test had a p-value < 0.001, indicating that item 14 interfered with unidimensionality.
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