The study sample represented 13,089 unique ZIP codes within the United States.
Sources
- Income and education show distinct links to health and happiness in daily life (nature.com)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC13383670/ (pmc.ncbi.nlm.nih.gov)
- https://www.researchgate.net/publication/394406880_Income_and_education_show_distinct_links_to_health_and_happiness_in_daily_life (researchgate.net)
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