ArticleSSM - population health2026
Identifying clinical and lifestyle factor mediators of the association between socioeconomic status and colorectal cancer mortality.
Article in SSM - population health, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
Purpose: Higher SES is associated with lower mortality among colorectal cancer (CRC) survivors. We performed a mediation analysis to identify factors that mediate the association between household income and CRC mortality. Methods: Data arise from 1038 participants of the prospective Southern Community Cohort Study (SCCS) who developed incident CRC after enrollment (2002-2009); 73% self-identify as Black. Fifty-nine percent self-reported household income <$15,000/year. Mortality outcomes were determined via the National Death Index. Proportional hazards models were used to estimate hazard ratios (HRs) with 95% confidence intervals (CIs) for mortality by income level. Mediation analysis was used to estimate indirect effects of stage, healthcare-access and use, comorbidities and health behaviors on mortality. Results: Higher income was associated with lower risk for all-cause mortality (≥$15,000 vs. <$15,000/year: HR = 0.70, 95%CI:0.58-0.84) and CRC-specific mortality (HR = 0.75, 95%CI:0.59-0.94). Differences in stage and surgical resection together explained 33% of the association with CRC-specific mortality and 16% for all-cause mortality. Smoking history explained 11% of the association with all-cause mortality and 9% for CRC-specific mortality. Diet explained 9% of the association with each outcome. Adjustment for all potential mediators explained 26% and 44% of the associations with all-cause and CRC-specific mortality, respectively. Associations between income and mortality were similar for participants with local/regional tumors only. Conclusions: Differences in early detection and surgical resection are the strongest mediators of the association between income and mortality. SES-targeted health policies and patient navigation will improve CRC outcomes. Additionally, health policies to address smoking cessation and food availability will create opportunities for interventions to promote health equity.
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