Threshold, Care Climate, and Place: Unmet ADL Support and Late-Life Depressive Symptoms

Drawing on two waves of the Chinese Longitudinal Healthy Longevity Survey, this study advances a Threshold–Care Climate–Place lens on late-life depression by asking whether any shortfall in assistance with daily activities relates to depressive symptoms, and how that link depends on the relational tone of family care and the contexts in which older adults live. To balance breadth with depth, depression is measured both as a cross-wave harmonized indicator and, within a single wave, as a continuous severity scale that preserves symptom gradation. Unmet support is defined in complementary ways as strict unmet, meaning help is not provided at all, and any unmet, meaning there is any shortfall; care climate is recoded as supportive or negative to capture the affective tenor of everyday care. A portfolio of estimators combines pooled models with year effects and clustered errors, doubly robust average-effect estimation, a four-cell configuration of unmet by care climate, and region-stratified and multilevel checks. Three patterns emerge: evidence is threshold-sensitive, with any shortfall linked to higher depressive risk when information is preserved or imbalance reduced; care climate amplifies the link, with strict unmet under a negative tone riskiest and supportive care attenuating risk; and place shapes baselines rather than slopes, with urban settings elevating background risk and eastern regions lowering it. The findings suggest that measurement and selection can mask meaningful associations and support practice that treats any shortfall as a screening trigger, pairs assistance with attitude-focused micro-interventions, and reads outcomes against local baselines.