JOURNAL ARTICLE

PROMIS® Parent Proxy Report Scales: an item response theory analysis of the parent proxy report item banks

James W Varni, David Thissen, Brian D Stucky, Yang Liu, Hally Gorder, Debra E Irwin, Esi Morgan DeWitt, Jin-Shei Lai, Dagmar Amtmann, Darren A DeWalt
Quality of Life Research 2012, 21 (7): 1223-40
21971875

OBJECTIVE: The objective of the present study is to describe the item response theory (IRT) analysis of the National Institutes of Health (NIH) Patient Reported Outcomes Measurement Information System (PROMIS(®)) pediatric parent proxy-report item banks and the measurement properties of the new PROMIS(®) Parent Proxy Report Scales for ages 8-17 years.

METHODS: Parent proxy-report items were written to parallel the pediatric self-report items. Test forms containing the items were completed by 1,548 parent-child pairs. CCFA and IRT analyses of scale dimensionality and item local dependence, and IRT analyses of differential item functioning were conducted.

RESULTS: Parent proxy-report item banks were developed and IRT parameters are provided. The recommended unidimensional short forms for the PROMIS(®) Parent Proxy Report Scales are item sets that are subsets of the pediatric self-report short forms, setting aside items for which parent responses exhibit local dependence. Parent proxy-report demonstrated moderate to low agreement with pediatric self-report.

CONCLUSIONS: The study provides initial calibrations of the PROMIS(®) parent proxy-report item banks and the creation of the PROMIS(®) Parent Proxy-Report Scales. It is anticipated that these new scales will have application for pediatric populations in which pediatric self-report is not feasible.

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