Article

The present study examined the Patient Reported Outcomes Measurement Information System (PROMIS) Mobility, Fatigue, and Pain Interference Short Forms
(SFs) in children and adolescents with cerebral palsy (CP) for the presence of
differential item functioning (DIF) relative to the original calibration sample.
METHOD: Using the Graded Response Model we compared item parameter estimates
generated from a sample of 303 children and adolescents with CP (175 males, 128
females; mean age 15y 5mo) to parameter estimates from the PROMIS calibration
sample, which served as the reference group. DIF was assessed in a two-step
process using the item response theory-likelihood ratio-differential item
functioning detection procedure. RESULTS: Significant DIF was identified for four
of eight items in the PROMIS Mobility SF, for two of eight items in the Pain
Interference Scale, and for one item out of 10 on the Fatigue Scale. Impact of
DIF on total score estimation was notable for Mobility and Pain Interference, but
not for Fatigue. INTERPRETATION: Results suggest differences in the responses of
adolescents with CP to some items on the PROMIS Mobility and Pain Interference
SFs. Cognitive interviews about the PROMIS items with adolescents with varying
degrees of mobility limitations would provide better understanding of how they
are interpreting and selecting responses to the PROMIS items and thus help guide
selection of the most appropriate way to address this issue.
CI - (c) 2016 Mac Keith Press.

Langue : ANGLAIS