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Qual Life Res. 2010 Feb;19(1):125-36. doi: 10.1007/s11136-009-9560-5. Epub 2009 Nov 26.

Efficiency of static and computer adaptive short forms compared to full-length measures of depressive symptoms.

Author information

  • 1Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA. s-choi@northwestern.edu

Abstract

PURPOSE:

Short-form patient-reported outcome measures are popular because they minimize patient burden. We assessed the efficiency of static short forms and computer adaptive testing (CAT) using data from the Patient-Reported Outcomes Measurement Information System (PROMIS) project.

METHODS:

We evaluated the 28-item PROMIS depressive symptoms bank. We used post hoc simulations based on the PROMIS calibration sample to compare several short-form selection strategies and the PROMIS CAT to the total item bank score.

RESULTS:

Compared with full-bank scores, all short forms and CAT produced highly correlated scores, but CAT outperformed each static short form in almost all criteria. However, short-form selection strategies performed only marginally worse than CAT. The performance gap observed in static forms was reduced by using a two-stage branching test format.

CONCLUSIONS:

Using several polytomous items in a calibrated unidimensional bank to measure depressive symptoms yielded a CAT that provided marginally superior efficiency compared to static short forms. The efficiency of a two-stage semi-adaptive testing strategy was so close to CAT that it warrants further consideration and study.

PMID:
19941077
[PubMed - indexed for MEDLINE]
PMCID:
PMC2832176
Free PMC Article

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