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Table 1 Socioeconomic characteristics of children aged ≤ 10 years enrolled in a population-based case-control study to identify risk factors for Salmonella infections, Michigan, 2007.

From: Case-control study of disease determinants for non-typhoidal Salmonella infections among Michigan children

Socioeconomic characteristics Cases
n = 123
Controls
n = 139
p-value*
  No. (%) No. (%)  
Age (year)      0.54
   < 1 22 (17.89) 25 (17.99)  
   1-<6 66 (53.66) 66 (47.48)  
   6-10 35 (28.46) 48 (34.53)  
Sex      0.86
   Female 66 (53.66) 76 (54.68)  
   Male 57 (46.34) 63 (45.32)  
Race      < 0.01*
   Caucasians 107 (87.70) 92 (67.15)  
   African-Americans 9 (7.38) 27 (19.71)  
   Other minorities (e.g., Asian, Alaskan Indian) 6 (4.92) 18 (13.14)  
Parental education      0.94
   Elementary to High school 30 (24.39) 33 (23.91)  
   Some college to college degree 72 (58.54) 85 (61.59)  
   Post-graduate degree 19 (15.45) 18 (13.04)  
   Refused to answer 2 (1.63) 2 (1.45)  
Annual income household      0.34
   <$ 35,000 26 (21.31) 25 (18.12)  
   $35,001- $50,000 17 (13.93) 17 (12.32)  
   $50,001- $75,000 28 (22.95) 39 (28.26)  
   >$75,000 38 (31.15) 33 (23.91)  
   Refused to answer 13 (10.66) 24 (17.39)  
Area of residence      0.31
   High income: $>60000 31 (25.20) 35 (25.18)  
   Medium income: $38000 - $60000 56 (45.53) 74 (53.24)  
   Low income: $<38000δ 36 (29.27) 30 (21.58)  
  1. *significant at P < 0.05. P-value were computed using chi-square test
  2. δ Categorized based on zip code level median household income obtained from the US Bureau of Census, 2000.