A New Depression Scale Designed to be Sensitive to Change

TLDR

The study highlights that a more sensitive depression scale could reduce required sample sizes in clinical trials, addressing practical and ethical concerns. The authors aim to construct a depression rating scale that is especially sensitive to treatment effects. They identified 17 core depressive symptoms from a 65‑item scale in 106 patients, then selected the 10 items that showed the greatest treatment‑related change and strongest correlation with overall change in 64 patients across four antidepressant trials. The new 10‑item scale demonstrated high inter‑rater reliability, strong correlation with the Hamilton Rating Scale, and superior ability to distinguish responders from non‑responders compared to the HRS.

Abstract

Summary The construction of a depression rating scale designed to be particularly sensitive to treatment effects is described. Ratings of 54 English and 52 Swedish patients on a 65 item comprehensive psychopathology scale were used to identify the 17 most commonly occurring symptoms in primary depressive illness in the combined sample. Ratings on these 17 items for 64 patients participating in studies of four different antidepressant drugs were used to create a depression scale consisting of the 10 items which showed the largest changes with treatment and the highest correlation to overall change. The inter-rater reliability of the new depression scale was high. Scores on the scale correlated significantly with scores on a standard rating scale for depression, the Hamilton Rating Scale (HRS), indicating its validity as a general severity estimate. Its capacity to differentiate between responders and non-responders to antidepressant treatment was better than the HRS, indicating greater sensitivity to change. The practical and ethical implications in terms of smaller sample sizes in clinical trials are discussed.