DG Journal Club
OBJECTIVE Abdominal pain is a common presenting complaint in youth seeking medical care and can be debilitating. Therefore, it is important to understand the impact of pain on functioning using a clinically sensitive approach. In recent years, the National Institutes of Health has established a common core of psychometrically precise measures through the Patient-Reported Outcomes Measurement Information System (PROMIS) initiative. The Pediatric PROMIS-Pain Interference (PPPI) scale was developed to measure pain-related interference, drawing from existing legacy measures. However, its clinical validity has not been thoroughly established in clinical populations. The current study sought to develop clinical cut-points and investigate the validity of the PPPI in a large sample (N=5281) of youth presenting to gastroenterological care with abdominal pain symptoms.
METHODS Convergent validity of the PPPI was investigated. Quartile and tertile groupings of the PPPI were calculated and compared to cut-points derived from healthy populations and mixed convenience samples on clinical outcomes via multivariate analyses of variance (MANOVAs).
RESULTS There was good evidence of convergent validity. The tertile solution was superior in classifying different levels of pain-related outcomes as compared to other cut-points. The tertile solution suggested the following PPPI groupings: minimal (≤51), moderate (52-59), and severe (≥60).
DISCUSSION Results suggest the PPPI is a valid measure with clinically meaningful cut-points to assess pain-related interference in youth with abdominal pain.