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Assessing depression in systemic lupus erythematosus: determining reliable change

University of British Columbia and Riverview Hospital, Vancouver,Canada; Department of Psychiatry, 2255 Wesbrook Mall, University of British Columbia, Vancouver, BC, Canada V6T 2A1

D C Sawyer

University of British Columbia and Riverview Hospital, Vancouver, Canada

L M McCracken

The University of Chicago, Chicago, Illinois, USA

E Kozora

National Jewish Medical and Research Center and University of Colorado Health Sciences Center, Colorado, USA

Systemic lupus erythematosus (SLE) can follow an unpredictable course. Clinicians and researchers use various self-report inventories to track aspects of the patient's functioning during the course of the illness (eg health status, pain, fatigue, quality of life and psychological status). These self-report inventories are used to measure improvement or deterioration as a function of the natural history of the disease process, or as a function of response totreatment. Proper interpretation of scores derived from these inventories requires an understanding of their psychometric properties, in particular, their reliability. It is important to calculate reliable change difference scores fortests commonly used in rheumatology so clinicians can determine if a change score is a reliable indicator of improvement or deterioration in individual patients (ie the change score is not likely to be due to measurement error). The purpose of this article is to illustrate the use of the reliable change difference scores when assessing depression in patients with SLE using the Beck Depression Inventory (BDI).

Key Words: depression • systemic lupus erythematosus • measurement

Lupus, Vol. 10, No. 4, 266-271 (2001)
DOI: 10.1191/096120301680416959


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