PROMIS physical function scores in cases of cardiology and rheumatology were altered by the use of subdomain-specific item sets

Author(s): Nehal El-Ghobashy

Objectives: The Case- Reported issues Measurement Information System (PROMIS) physical function (PF) item bank has been developed to regularize case- reported PF across medical fields. Still, substantiation of scoring parity across cardiology and rheumatology cases is still missing. thus, this study aims to probe both( 1) the extent of complaint- related discriminational item performing( DIF) and( 2) the impact of the complaint group on using subdomain-specific item sets for generating PROMIS PF scores in cardiology and rheumatology cases.

Study Design and Setting: Ordinal retrogression was used to estimate DIF between cardiology (n = 201) and rheumatology (n = 200) convalescents. To explore the complaint-specific impact of PF subdomains on scoring, we compared scores deduced from the full item bank with scores deduced from subdomain-specific item sets for each complaint group.

Results: DIF was detected in 18 particulars, predominately from the upper extremity subdomain. When upper extremity particulars were used, cardiology cases reached totally advanced scores than using the full item bank. Rheumatology cases scored mainly advanced when mobility particulars were used.

Conclusion: Applying the PROMIS PF metric to complaint-specific item sets including particulars from differing subdomains may lead to prejudiced comparisons of PF situations across complaint groups. Disease-specific item parameters should be handed for particulars showing DIF, and subdomain- related content balancing is recommended for scoring the general PROMIS PF construct.