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01-11-2011 | Uitgave 9/2011

Quality of Life Research 9/2011

Migrating from a legacy fixed-format measure to CAT administration: calibrating the PHQ-9 to the PROMIS depression measures

Tijdschrift:
Quality of Life Research > Uitgave 9/2011
Auteurs:
Laura E. Gibbons, Betsy J. Feldman, Heidi M. Crane, Michael Mugavero, James H. Willig, Donald Patrick, Joseph Schumacher, Michael Saag, Mari M. Kitahata, Paul K. Crane
Belangrijke opmerkingen

Electronic supplementary material

The online version of this article (doi:10.​1007/​s11136-011-9882-y) contains supplementary material, which is available to authorized users.
An erratum to this article can be found online at http://​10.​1007/​s11136-012-0313-5.

Abstract

Purpose

We provide detailed instructions for analyzing patient-reported outcome (PRO) data collected with an existing (legacy) instrument so that scores can be calibrated to the PRO Measurement Information System (PROMIS) metric. This calibration facilitates migration to computerized adaptive test (CAT) PROMIS data collection, while facilitating research using historical legacy data alongside new PROMIS data.

Methods

A cross-sectional convenience sample (n = 2,178) from the Universities of Washington and Alabama at Birmingham HIV clinics completed the PROMIS short form and Patient Health Questionnaire (PHQ-9) depression symptom measures between August 2008 and December 2009. We calibrated the tests using item response theory. We compared measurement precision of the PHQ-9, the PROMIS short form, and simulated PROMIS CAT.

Results

Dimensionality analyses confirmed the PHQ-9 could be calibrated to the PROMIS metric. We provide code used to score the PHQ-9 on the PROMIS metric. The mean standard errors of measurement were 0.49 for the PHQ-9, 0.35 for the PROMIS short form, and 0.37, 0.28, and 0.27 for 3-, 8-, and 9-item-simulated CATs.

Conclusions

The strategy described here facilitated migration from a fixed-format legacy scale to PROMIS CAT administration and may be useful in other settings.

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Extra materiaal
Supplementary material 1 (DOC 272 kb)
11136_2011_9882_MOESM1_ESM.doc
Literatuur
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