Association of vitamin D status with socio-demographic factors in Calgary, Alberta: an ecological study using Census Canada data

BMC Public Health

Brenda R Hemmelgarn⁴  Paul Woods²  Dan Henne¹  Jianguo Zhang⁴  Christopher Naugler³ 

[1] Calgary Laboratory Services, Calgary, Alberta, Canada;Department of Family Medicine, University of Calgary, Calgary, Alberta, Canada;C414, Diagnostic and Scientific Centre, 9, 3535 Research Road NW, Calgary, AB T2L 2K8, Canada;Department of Medicine, University of Calgary, Calgary, Alberta, Canada

关键词: Sociodemographic factors;    Ecological study;    Vitamin D;   

Others  :  1162365
DOI  :  10.1186/1471-2458-13-316

 received in 2012-10-15, accepted in 2013-04-04,  发布年份 2013

【 摘 要 】

Background

Low 25-hydroxyvitamin D levels are a global health problem with northern countries such as Canada at particular risk. A number of sociodemographic factors have been reported to be associated with low vitamin D levels but prior studies have been limited by the ability of the researchers to gather this data directly from clinical trial participants. The purpose of this study was to use a novel methodology of inferring sociodemographic variables to evaluate the correlates of vitamin D levels in individuals dwelling in the City of Calgary, Alberta, Canada.

Methods

We utilized data on vitamin D test results from Calgary Laboratory Services between January 1 2010 and August 31 2011. In addition to vitamin D level, we recorded age, sex, and vitamin D testing month as individual-level variables. We inferred sociodemographic variables by associating results with census dissemination areas and using Census Canada data to determine immigration status, education, median household income and first nations status as clustered variables. Associations between vitamin D status and the individual- and dissemination area-specific variables were examined using the population-averaged regression model by a generalized estimating equations approach to account for the clustering in the data.

Results

158,327 individuals were included. Age, sex, month of vitamin D testing (at an individual level), and education, immigrant status, first nations status and income (at an aggregate level) were all statistically significant predictors of vitamin D status.

Conclusions

Vitamin D status was associated with a number of sociodemographic variables. Knowledge of these variables may improve targeted education and public health initiatives.

【 授权许可】

   
2013 Naugler et al.; licensee BioMed Central Ltd.

【 图 表 】

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