Estimating the heterogeneous effect of life satisfaction on mortality: A causal machine-learning approach.
Bibliographic record
Abstract
OBJECTIVE: Life satisfaction has been linked to lower mortality risk, yet the extent to which this relationship varies across population subgroups remains poorly understood. METHOD: = 13,674), a national cohort study of U.S. adults aged 50 and older. RESULTS: On average, higher life satisfaction was linked to a 3.56-month increase in restricted mean survival time (95% confidence interval = [1.61, 5.52]). While we observed evidence of between-individual heterogeneity in this association, the estimated effect of life satisfaction appeared beneficial for most individuals in this study. Evidence of the protective effect of life satisfaction was more pronounced among those who identified as racial minorities and reported lower educational attainment, fewer economic resources, and poorer prebaseline health. CONCLUSIONS: These findings indicate that population-level strategies to foster higher life satisfaction could improve the health of older adults on average, while decreasing existing disparities in longevity. (PsycInfo Database Record (c) 2026 APA, all rights reserved).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.026 | 0.093 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.003 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.004 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".