What it is
A sense of purpose and a generally optimistic outlook, each self-reported on a scale. This page merges two related traits into one comparison. Both are observational only — no trial has raised someone's purpose or optimism to test whether death rates actually change — and both carry real confounding risk: people who are already sicker plausibly feel less purposeful and less optimistic, not only the other way around.
How it is modeled (not scored)
Technical notes
Purpose curve is Cohen 2016: meta-analysis, 10 studies, 136,265 people. Adjusted pooled all-cause mortality RR 0.83 (0.75–0.91), higher vs lower purpose. Main source: Cohen. Supporting: Sutin 2025 (though not a second meta-analysis — no update to Cohen was found; UK Biobank, n=153,505, per-SD HR 0.87 (0.85–0.90) unadjusted, attenuating to 0.91 (0.88–0.94) after full adjustment) / Alimujiang 2019 (extreme-category HR 2.43 (1.57–3.75), lowest vs highest purpose, a much larger number because it contrasts the two extremes rather than a general gradient) / Boyle 2009 (the association survived adjusting for depression, disability, neuroticism, chronic conditions and income, HR 0.60 (0.42–0.87), the field's clearest reverse-causation check, in a small cohort). Optimism curve is Rozanski 2019: meta-analysis, 15 cohort studies, 229,391 people, same senior-author lineage as the purpose literature. Pooled all-cause mortality RR 0.86 (0.80–0.92). Supporting: Krittanawong 2022 (independent corroborating pool, HR 0.87 (0.82–0.92), almost the same point estimate) / Anthony 2016 (a real single-cohort null: no association found for all-cause, CVD or cancer mortality once adjusted, though coronary-specific mortality was lower) / Kim 2017 (the field's clearest confounding demonstration: highest-vs-lowest optimism quartile HR 0.71 (0.66–0.76) with only sociodemographic adjustment, attenuating to 0.91 (0.85–0.97) once health behaviors, health conditions and depression are added — roughly two-thirds of the raw association is explained away).
How to improve it
- Identify what gives your day meaning and build time for it
- Practice noticing what is going well, not just what is going wrong
- Try a brief "best possible self" writing exercise
- Build one supportive relationship or community tie