Relationship quality and 5-year mortality risk Limited Relationship qualityObservational evidenceReverse causation riskSelf-report bias Observational study Older-adult cohort: negative relationship quality OR 1.20 over 5 years; criticism OR 1.44 Causal status: Association Reliability / bias notes: Small event count; self-report; reverse causation; limited generalisability Bookwala & Gaugler · Health Psychol · 2020 · PMID 32406727 Read the study →