PRPP-ASSESSMENT TO MEASURE CHANGE 205 8 Quantitative analysis on responsiveness of PRPP-Assessment Of the 15 hypotheses formulated a priori for testing responsiveness, 13 were accepted, resulting in an 86% acceptance rate, which can be seen as adequate for measuring change52. Table 1 provides an overview of the statistical information for each hypothesis. Next, we will elaborate on each aspect of responsiveness. Longitudinal validity Overall, eight out of nine activities improved on the PRPP-Assessment. Figure 3 gives an overview of the pre- and post- PRPP-M scores for the different activities, showing how well the child can perform the activity without errors measured against the personalized criterion. Figure 4 gives an overview of the sum score (PRPP-S) of the cognitive strategies used to perform the activities. A further specification of the (sub)quadrants can be found in the supplementary data. These results show that in all activities were the PRPP-M improved, the PRPP-S improved as well, and vice versa. As expected, not in all cases where the PRPP-S changed did the PRPP-M change as well; in all nine activities the PRPP-S improved, corresponding to eight improved PRPP-M scores. These outcomes resulted in acceptance of Hypotheses 1 and 2. The scores for the COPM-P and the GAS are presented in table 2, showing that in eight cases where the PRPP-M has improved, the parent-rated COPM-P improved as well. In one case the PRPP-M stayed stable; in this case, the parent-rated COPM-P deteriorated. As expected, the outcomes showed less congruence between the PRPP-M scores and the child-rated COPM-P. There were six activities scored by children on the COPM-P. Three of these six activities improved both on the PRPP-M and on the child-rated COPM-P. For the other three, two stayed stable on the child-rated COPM-P but improved on the PRPP-M, and one improved by 1 point on the child-rated COPM-P while the PRPP-M stayed stable. For the GAS, all nine activities improved and these outcomes resulted in acceptance of Hypotheses 3–8. The correlation between the change scores on the parent-rated COPM-P and PRPP-M resulted in a Spearman’s rho Correlation Coefficient of 0.41 (with a p-value of .092), and between the PRPP-M and the GAS in a Spearman’s rho Correlation Coefficient of 0.52 (with a p-value of .026), leading to the acceptance of Hypotheses 9 and 10.
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