CHAPTER 7 166 Data Analysis Tasks performed by children in each video were categorized using the Occupational Performance Model Australia (OPMA; the conceptual model that is the foundation for the PRPP-Assessment)[43], the International Classification of Functioning, Disability and Health for Children and Youth (ICF-CY)[44] and previous research on the meaning of activities[8, 33]. An overview of the task-categories and all the activities in the sample are presented in appendix 1. The ICF-CY categories were used in analyzing the data. For the overall performance of children, the scores were summarized with descriptive statistics for the total group of children and the subgroups per functioning profile. Intra-Rater Reliability For intra-rater reliability, the Level of Agreement was determinedwith a Bland-Altman Plot and calculated for PRPP-Assessment stage 1 mastery score, PRPP-Assessment stage 1 error score (percentage of the overall number of task steps), PRPP-Assessment stage 2 sum score, and PRPP-Assessment (sub)quadrants score. Reliability is acceptable when 95% of the differences scores are within the 95% limits of agreement[40]. Internal Consistency Internal consistency was determined only for stage 2 as for stage 1 it is not possible due to the various task analyses. Internal consistency was determined with Cronbach’s Alpha and estimated on 0.7 or higher for an adequate level of consistency[40]. Two calculations were made; one with all 35 descriptors (items) and one where the descriptor ‘matches’ is excluded as this descriptor does not apply to all activities, and therefore can get ‘no score’. Inter-Rater Reliability For inter-rater reliability, the ICCagreement and ICCconsistency with a two-way random model, single measures, was determined for PRPP-Assessment stage 1 mastery score, PRPP-Assessment stage 2 sum score, and PRPP-Assessment quadrants score. A priori, an acceptable agreement was defined as 0.6 or higher[45]. Data were analyzed using SPSS for Windows version 26.0 (New York, IBM corporation, 2019). Construct Validity Following guidelines of the COSMIN[42, 46, 47, 48], a priori hypotheses were formulated to support construct validity by assessing convergent, structural, and known group validity. Hypotheses are presented in table 3.
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