Table 1 SES characteristics and Salmonella infection at the block group level. Socioeconomic and demographic predictors of Salmonella infections at the block group level in a tri-county area of Michigan (1997–2006): results of a multivariable Poisson regression model. (n = 3,419)

Education attainment (aged ≥ 25 years) at block group level

   College degree and above

   High school degree, some college education but no degree

   None to less than a high school degree

Annual median household income at block group level (highest to lowest)

   4^th quartile (≥ $ 60,000)

   3^rd quartile ($ 47,000 – < $60,000)

   2^nd quartile ($33,000 – < $ 47,000)

   1^st quartile (< $ 33,000)

Race at block group level (based on the largest proportion)

   Caucasian, predominantly

   African American, predominantly

   Other, predominantly

Area of residence at block group level (based on US Bureau of Census definition)

   Rural, predominantly

   Urban-rural mixed

   Urban, predominantly