Objective. This study assessed the association between self-ratings and key-worker ratings of depression in people with mild learning disabilities. Method. The Zung Depression Scale was completed by 74 adults with mild learning disabilities and a modified version of the questionnaire was completed by two key-workers at two periods in time. Results. The correlations between ratings of depression by key-workers were high and key-worker ratings correlated significantly with self-rating. The depression scores were found to be temporally stable. Conclusions. The findings suggest that proxy raters appear to be able to make reliable and valid judgements about other people's self-reported levels of depression.
Gordon, M., Shevlin, M., Tierney, K. J., Bunting, B., & Trimble, T. (2007). Correspondence between self-ratings and key-workers' ratings of depression in adults with mild learning disabilities. British Journal of Clinical Psychology, 46(Part 4), 491-495. https://doi.org/10.1348/014466507X194373