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01-11-2011

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

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

Gepubliceerd in: Quality of Life Research | Uitgave 9/2011

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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Titel: Migrating from a legacy fixed-format measure to CAT administration: calibrating the PHQ-9 to the PROMIS depression measures
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
Publicatiedatum: 01-11-2011
Uitgeverij: Springer Netherlands
Gepubliceerd in: Quality of Life Research / Uitgave 9/2011
Print ISSN: 0962-9343
Elektronisch ISSN: 1573-2649
DOI: https://doi.org/10.1007/s11136-011-9882-y

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Abstract

Purpose

Methods

Results

Conclusions

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