1인가구 중고령자의 일상생활수행능력(ADL/IADL) 및 우울감의 변화궤적과 삶의 만족도: 병렬과정 잠재성장모형의 적용

Abstract

The purpose of this study is to investigate longitudinal trajectories of activities of daily living (ADL), instrumental activities of daily living (IADL), depression, and their associations with life satisfaction among middle-aged people living in single-person households. Data were drawn from waves 1-6 of the Korean Longitudinal Study of Ageing(KLoSA), and a sample of 748 respondents was analyzed using descriptive statistics, Pearson’s correlations, univariate growth curve models, and a parallel process latent growth model with SPSS and Mplus. The results were as follows. Univariate growth models revealed that while ADL/IADL increased over time, no significant change was observed in depression. A parallel latent growth model showed that the initial level of ADL/IADL was predictive of the slope of depression, indicating that the higher initial level of ADL/IADL was associated with faster increases in depression over time. In addition, the initial level of depression was significantly related to the slope of ADL/IADL, showing that ADL/IADL develops faster over time when the initial level of depression was higher. Lastly, both intercept and slope of depression were associated negatively with life satisfaction, while the slope of ADL/IADL, but not the initial level, was negatively associated with life satisfaction. The present study reveals the concurrent developmental trajectories of ADL/IADL and depression, resulting in deteriorating health outcomes. Findings also suggest conjoint influences of ADL/IADL and depression as robust antecedents of life satisfaction.