Measuring improvement in depression in cancer patients: a 50% drop on the self-rated SCL-20 compared with a diagnostic interview.

Abstract:

OBJECTIVE:To determine the validity of a 50% drop in the 20-item Symptom Checklist Depression Scale (SCL-20) score against the "gold standard" of no longer meeting criteria for major depression as assessed using a diagnostic interview in an outpatient cancer population and also to examine the validity of other potential cut-offs (i.e., percentage drops). MATERIALS AND METHODS:Secondary analysis of data from a randomized trial which compared collaborative care with usual care for cancer patients with major depression. A total of 194 trial participants who had both SCL-20 scores and depression diagnoses on the Structured Clinical Interview for DSM-IV at both baseline and at 12-week outcome formed the analyzed sample. RESULTS:A 50% reduction in the SCL-20 score from baseline to 12 weeks correctly identified the patients who no longer met criteria for major depression in 153 (78.9%) of 194 (95% CI 73.1% to 84.6%) cases. Most of those misclassified had not achieved a 50% reduction in SCL-20 score despite no longer meeting criteria for major depression. Examination of the performance of percentage drops other than 50% on the SCL-20 using a receiver operating characteristics (ROC) curve and histogram of misclassification suggested that the 50% drop was best if both a low overall misclassification rate and the minimizing of false positives of improvement were required. CONCLUSIONS:A 50% reduction in the SCL-20 score performs well as a conservative measure of change in depression status in cancer patients.

journal_name

Gen Hosp Psychiatry

authors

O'Connor M,Butcher I,Hansen CH,Kleiboer A,Murray G,Sharma N,Thekkumpurath P,Walker J,Sharpe M

doi

10.1016/j.genhosppsych.2010.01.001

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

334-6

issue

3

eissn

0163-8343

issn

1873-7714

pii

S0163-8343(10)00002-2

journal_volume

32

pub_type

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