Fig. 2From: Qualitative and psychometric approaches to evaluate the PROMIS pain interference and sleep disturbance item banks for use in patients with rheumatoid arthritisStandard error (A) and marginal reliability (B) of the 40-item PROMIS Pain Interference bank, the 27-item version recommended by the qualitative data, a 13-item candidate short form, and the final recommended 11-item short form. PROMIS, Patient-Reported Outcomes Measurement Information System; SE, standard errorBack to article page