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01-02-2010 | Uitgave 1/2010

Quality of Life Research 1/2010

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

Tijdschrift:
Quality of Life Research > Uitgave 1/2010
Auteurs:
Seung W. Choi, Steven P. Reise, Paul A. Pilkonis, Ron D. Hays, David Cella

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.

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