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Association between C reactive protein and all-cause mortality in the ELSA-Brasil cohort
Chams B Maluf1, Sandhi Maria Barreto2, Luana Giatti2
1Clinical Pathology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil chamsbm12@gmail.com.
Insights
High-sensitivity C reactive protein (hsCRP) is linked to increased mortality risk in a diverse Brazilian population. This association remained significant even after accounting for various health and lifestyle factors.
Area of Science:
- Biomedical research
- Epidemiology
- Public health
Background:
- High-sensitivity C-reactive protein (hsCRP) is a potential biomarker for cardiovascular and non-vascular mortality.
- Existing evidence primarily originates from North American and European populations.
- The role of hsCRP in mortality risk within multiethnic populations remains underexplored.
Purpose of the Study:
- To investigate the association between hsCRP levels and all-cause mortality risk.
- To examine this association in a multiethnic Brazilian cohort.
- To determine if the association persists after adjusting for confounders.
Main Methods:
- Utilized baseline data from 14,238 participants in the Brazilian Longitudinal Study of Adult Health (2008-2010).
- Assayed hsCRP using immunochemistry.
- Employed Cox regression analysis for univariate and adjusted models over a mean follow-up of 8.0±1.1 years.
Main Results:
- Mortality risk increased progressively with higher hsCRP quartiles (Q2: HR 1.45, Q4: HR 1.95 vs. Q1).
- The graded association persisted after excluding early deaths, suggesting it's not due to reverse causality.
- Hazard ratios remained consistent after excluding participants with self-reported diabetes, cancer, or COPD.
Conclusions:
- hsCRP levels are significantly associated with all-cause mortality in a highly admixed Brazilian population.
- This association is independent of a wide range of lifestyle and clinical variables.
- hsCRP may serve as a valuable mortality risk marker across diverse ethnic groups.
Background:
High-sensitivity C reactive protein (hsCRP) has been proposed as a marker of incident cardiovascular disease and vascular mortality, and may also be a marker of non-vascular mortality. However, most evidence comes from either North American or European cohorts. The present proposal aims to investigate the association of hsCRP with the risk of all-cause mortality in a multiethnic Brazilian population.
Methods:
Baseline data (2008-2010) of a cohort of 14 238 subjects participating in the Brazilian Longitudinal Study of Adult Health were used. hsCRP was assayed with immunochemistry. The association of baseline covariates with all-cause mortality was calculated by Cox regression for univariate model and adjusted for different confounders after a mean follow-up of 8.0±1.1 years. The final model was adjusted for age, sex, self-rated race/ethnicity, schooling, health behaviours and prevalent chronic disease.
Results:
The risk of death increased steadily by quartiles of hsCRP, from 1.45 (95% CI 1.05 to 2.01) in quartile 2 to 1.95 (95% CI 1.42 to 2.69) in quartile 4, compared with quartile 1. Furthermore, the persistence of a significant graded association after the exclusion of deaths in the first year of follow-up suggests that these results are unlikely to be due to reverse causality. Finally, the HR was unaffected by the exclusion of participants who had self-reported medical history of diabetes, cancer and chronic obstructive pulmonary disease.
Conclusions:
Our study shows that hsCRP level is associated with mortality in a highly admixed population, independent of a large set of lifestyle and clinical variables.
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