Medical care
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Constructing and evaluating item pools that measure a single domain of health-related quality of life (HRQOL) is one of the fundamental objectives of the Patient Reported Outcome Measurement and Information System (PROMIS) project. The initial focus of PROMIS is on 5 HRQOL domains: physical function, fatigue, pain, emotional distress, and social/role participation. Analysis of related, available data can inform construction of these new banks. ⋯ The 15 physical functioning items provide reasonably good fit to a unidimensional item response theory model that provides satisfactory coverage of the lower levels of physical functioning but does not provide very much information at higher levels of functioning.