Usability of the Japanese Late‐Stage Elderly Questionnaire for screening major depression

Background Older adults with major depression are at risk of frailty and long‐term care needs. Consequently, screening for major depression is imperative to prevent such risks. In Japan, the Late‐Stage Elderly Questionnaire was developed to evaluate older adults' holistic health, including mental well‐being. It comprises one specific question to gauge life satisfaction, but the effectiveness of this question to screen for major depression remains unclear. Therefore, we aimed to assess the usability of this question to screen for major depression. Methods This retrospective cohort study used a large, commercially available claims database in Japan. Participants were older adults aged ≥75 years who completed the Late‐Stage Elderly Questionnaire and were classified with and without new major depression within 1 year. We evaluated the questionnaire's ability to screen for major depression using C‐statistics, developing three models to assess the cut‐off value based on responses to the life satisfaction question (‘Satisfied’, ‘Somewhat satisfied’, ‘Somewhat unsatisfied’, or ‘Unsatisfied’), estimating the sensitivity and specificity of each model. Results Among 11 117 older adults, 77 newly experienced major depression within 1 year. The C‐statistic for screening major depression was 0.587. The model setting the cut‐off between ‘Somewhat unsatisfied’ and ‘Unsatisfied’ the demonstrated lowest sensitivity and highest specificity, while the model setting the cut‐off between ‘Satisfied’ and ‘Somewhat satisfied’ demonstrated highest sensitivity and lowest specificity. Conclusions Our results suggest that due to its poor screening ability and high rate of false negatives, the question assessing life satisfaction in the Late‐Stage Elderly Questionnaire may not be useful for screening major depression in older adults and may require modification.