Psychometric properties of the Chinese version of the Nursing Home Adjustment Scale (C-NHAS) in Central China: Classical test theory and item response theory.

Evidence for the nursing home adjustment scale (NHAS)' s applicability in less developed regions of China is still absent. Besides, there is a need to provide further validity evidence for the NHAS using modern test theory. This study aims to investigate the psychometric properties of the Chinese version of the NHAS (C-NHAS) in a sample of nursing home residents in central China. A total of 761 older adults who lived in 21 nursing homes in Hunan Province, China, were investigated from July 2021 to December 2021. The C-NHAS yielded a four-factor structure and showed good reliability and validity. The difficulty of items matched most individuals' ability, while a small number of individuals with low ability had no items for matching. The results indicated the C-NHAS is a reliable and valid instrument while the high difficulty may restrict the performance of the C-NHAS among the less educated older adults.