CHAPTER 7 178 Hypothesis 5: Expert statements on Hierarchy PRPP Descriptors Experts stated that due to the anticipated level of motor problems children will be challenged in the Perform Quadrant. They expected that the best functioning Quadrant would be Recall. More than half of the experts expected the descriptors “coordinates”, “calibrates”, “flows” and “uses body” to be more difficult in comparison to the known hierarchy of children [20]. Summarizing all item measures; the Recall Quadrant was indeed the easiest for children with mitochondrial disorder. The experts mentioned that the Perform Quadrant would be hard for children with mitochondrial disorder. Comparing the hierarchy output of this study to those of Nott et al.[20], the Perform Quadrant is indeed harder for the current studied population. The two statements on the Quadrants were correct, and three out of the four items were harder for children with mitochondrial disorder. Only “uses body” did not seem as hard for children with mitochondrial disorder as expected by the experts. In summary, five out of six statements were correct, so the hypothesis was accepted. Known Group Validity Hypothesis 6: Distinction in Strategy Application between the Profiles The graph (interaction plot) of Rasch calibrated mean scores generated for each of the 35 PRPP items for the three functioning profiles is shown in figure 4. Roughly, two patterns emerged. First, the global low functioning profile shows a less efficient cognitive strategy application than the other two functioning profiles. The other two profiles (mixed and global moderate) demonstrated a similar performance pattern across most PRPP items. Secondly, the difference in efficient cognitive strategy application between the low functioning profile and the other two profiles differs the most on the Perceive and Recall Quadrant. As the difference between groups is visually noticeable, the hypothesis is accepted.
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