Cluster analyses of pain patients' responses to the SCL-90R.

This study sought to identify distinct subgroups of chronic pain patients based on responses to the Symptom Checklist 90-revised (SCL-90R), a measure of psychological distress. Two scoring methods were used: the standard scoring that accompanies the manual, and a scoring method based upon factor scores obtained in an earlier study using low back pain patients. Two separate cluster analyses assigned patients into 2 groups: one based on standard scores and one based on factor scores.