Validation of the General Practitioner Clinical Research Group 11-item depression scale

Area of Science:

• Psychiatry
• Clinical Psychology
• General Practice Research

Background:

• Two depression rating scales, one with 17 symptoms and a shorter 11-item scale, are widely used in general practice.
• Neither of these extensively used scales has undergone validation against other depression measures.

Purpose of the Study:

• To validate the physician-completed 11-item depression scale.
• To compare the 11-item scale's performance against two patient-completed scales: the Zung self-rating depression scale and the Wakefield Inventory.

Main Methods:

• A validation study involving thirty patients diagnosed with depression.
• Statistical correlation analysis was performed between the physician-completed 11-item scale and the patient-completed Zung and Wakefield scales.

Main Results:

• The 11-item scale demonstrated a statistically significant correlation of 0.59 with the Zung scale and 0.5 with the Wakefield Inventory.
• A moderate correlation (0.69) was observed between the Zung and Wakefield scales, despite both being patient-completed measures of depression.
• All correlations were statistically significant at the 1% level.

Conclusions:

• The physician-completed 11-item depression scale shows moderate validity when compared to patient-completed measures.
• Findings suggest the 11-item scale can be a useful tool for depression assessment in clinical settings.
• Further research may be warranted to explore the discrepancies between patient-completed depression scales.