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BMC Public Health
Published in: BMC Public Health 1/2007

Open Access 01-12-2007 | Research article

Socioeconomic and racial/ethnic differentials of C-reactive protein levels: a systematic review of population-based studies

Authors: Aydin Nazmi, Cesar G Victora

Published in: BMC Public Health | Issue 1/2007

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Abstract

Background

Socioeconomic and racial/ethnic factors strongly influence cardiovascular disease outcomes and risk factors. C-reactive protein (CRP), a non-specific marker of inflammation, is associated with cardiovascular risk, and knowledge about its distribution in the population may help direct preventive efforts. A systematic review was undertaken to critically assess CRP levels according to socioeconomic and racial/ethnic factors.

Methods

Medline was searched through December 2006 for population-based studies examining CRP levels among adults with respect to indicators of socioeconomic position (SEP) and/or race/ethnicity. Bibliographies from located studies were scanned and 26 experts in the field were contacted for unpublished work.

Results

Thirty-two relevant articles were located. Cross-sectional (n = 20) and cohort studies (n = 11) were included, as was the control group of one trial. CRP levels were examined with respect to SEP and race/ethnicity in 25 and 15 analyses, respectively. Of 20 studies that were unadjusted or adjusted for demographic variables, 19 found inverse associations between CRP levels and SEP. Of 15 similar studies, 14 found differences between racial/ethnic groups such that whites had the lowest while blacks, Hispanics and South Asians had the highest CRP levels. Most studies also included adjustment for potential mediating variables in the causal chain between SEP or race/ethnicity and CRP. Most of these studies showed attenuated but still significant associations.

Conclusion

Increasing poverty and non-white race was associated with elevated CRP levels among adults. Most analyses in the literature are underestimating the true effects of racial/ethnic and socioeconomic factors due to adjustment for mediating factors.
Appendix
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Metadata
Title
Socioeconomic and racial/ethnic differentials of C-reactive protein levels: a systematic review of population-based studies
Authors
Aydin Nazmi
Cesar G Victora
Publication date
01-12-2007
Publisher
BioMed Central
Published in
BMC Public Health / Issue 1/2007
Electronic ISSN: 1471-2458
DOI
https://doi.org/10.1186/1471-2458-7-212

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