Age-Related Differences of Rumination on the Loneliness-Depression Relationship: Evidence from a Population-Representative Cohort

Abstract

Abstract Background and Objective This study examined the association of loneliness with depressive symptoms across various age groups. Loneliness is a significant risk factor for precipitating depressive symptoms. Rumination, a mechanism that underpins depression, can become intense when a person feels lonely. In addition, age is a major factor associated with changes in mental and physical health. Thus, the importance of rumination and age in moderating the loneliness–depression link were investigated. Research Design and Methods This cross-sectional study was conducted during the acute phase of the COVID-19 pandemic in Hong Kong (February 27 to March 17, 2020). A population-representative sample of 2,018 people (1,126 females; 15–92 years of age) was recruited and interviewed via telephone through random digit dialling. This sample included 394 younger adults (18–30 years), 1,106 middle-aged adults (31–64 years), and 472 older adults (65 years or above). Respondents reported depressive symptoms, subjective loneliness, state rumination, and sociodemographic factors. Results Loneliness and rumination were positively associated with depressive symptoms, and they significantly interacted in predicting cognitive-affective symptoms. Further analysis of age showed that the interaction was only significant only in middle-aged adults and older adults. Both rumination and age interacted with loneliness respectively in predicting cognitive-affective symptoms. Discussion and Implications These findings indicate that the strength of the association between loneliness and the cognitive-affective symptoms of depression depends on rumination levels and age. An intervention to regulate rumination offers a feasible direction for health care and social care aimed at improving older adults’ mental health.