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96), (3) structural validity by fit to a Rasch measurement model, (4) construct validity by moderate correlations with the Public and Patient Engagement Evaluation Tool, (5) good test-retest reliability (ICC =0.86) and (6) interpretability demonstrated by significant differences among PEIRS-22 scores across three levels of global meaningful engagement in research. The shortened PEIRS is valid and reliable for assessing the degree of meaningful patient and family caregiver engagement in research. It enables standardized assessment of e