Dagmar Amtmann|Karon F. Cook|Mark P. Jensen|Wen Hung Chen|Seung W. Choi|Dennis A. Revicki|David Cella|Nan Rothrock|Francis J. Keefe|Leigh F. Callahan|Jin Shei Lai
Development of a PROMIS item bank to measure pain interference
Northwestern University|Duke University Hospital|Duke Medical Center|University of Washington
paper describes psychometric properties promispain interference promispi bank initial candidate item pool n644 developed evaluated based review existing instruments interviews patients consultation pain experts pool candidate item bank 56 items selected responses items collected large community clinical samples total 14848 participants responded subset candidate items responses calibrated using item response theory irt model final 41item bank evaluated respect irt assumptions model fit differential item function dif precision construct concurrent validity items revised bank good fit irt model cfi nnfitli ranged 0974 0997 data strongly unidimensional eg ratio first second eigenvalue35 nine items exhibited statistically significant dif however adjusting dif little practical impact score estimates items retained without modifying scoring scores provided substantial information across levels pain scores tscore range 5080 reliability equivalent 096099 patterns correlations health outcomes supported construct validity item bank scores discriminated among persons different numbers chronic conditions disabling conditions levels selfreported health pain intensity p00001 results indicated promispi items constitute psychometrically sound bank computerized adaptive testing short forms available