The current study tested the utility of the PROMIS Pediatric Pain Interference (PPI) in relation to the widely-used Functional Disability Inventory (FDI) in a small-scale clinical trial.
Forty youth with juvenile fibromyalgia (JFM) were randomized to either CBT only or a combined CBT and neuromuscular exercise group (i.e., FIT Teens). Participants completed the PPI and FDI at baseline, post-treatment, and three-month follow-up.
The PPI and FDI were significantly correlated at baseline (r = .51) and post treatment (r = .53), and demonstrated similar improvements (d PPI = .87, d FDI = 1.22, p < .05) at post-treatment following FIT Teens. Following CBT only, neither the PPI nor the FDI improved significantly.
The PPI may be appropriate for use in non-pharmacologic interventions for pediatric pain.