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Table 1 Baseline demographic characteristics of cases and controls

From: Is drinking water a risk factor for endemic cryptosporidiosis? A case-control study in the immunocompetent general population of the San Francisco Bay Area

Characteristic Cases Controls
  N % N %
Gender     
   Male 13 50.0 33 53.2
   Female 13 50.0 29 46.8
Race a     
   White 17 65.4 43 69.3
   Black 3 11.5 4 6.5
   Native American 0 0.0 1 1.6
   Asian/Pacific Islander 1 3.9 6 9.7
   Other 4 15.4 8 12.9
Ethnicity a     
   Hispanic 7 26.9 14 22.6
   Non-Hispanic 18 69.2 48 77.4
County of residence b     
   Alameda 2 7.7 9 14.5
   Contra Costa 1 3.9 6 9.7
   Marin 1 3.9 2 3.3
   San Francisco 10 38.5 17 27.4
   San Mateo 5 19.2 7 11.3
   Santa Clara 6 23.1 18 28.0
   Solano 1 3.9 1 1.6
   Sonoma 0 0 2 3.2
Age group     
   1–5 years 5 19.2 10 16.1
   6–11 years 0 0.0 0 0.0
   12–17 years 3 11.5 8 12.9
   18–25 years 3 11.5 8 12.9
   26–44 years 12 46.2 29 46.8
   45–64 years 2 7.7 5 8.1
   65+ years 1 3.9 2 3.2
Chronic medical condition     
   Yes 9 34.6 16 24.2
   No 15 61.5 46 74.2
Missing 1 3.9 1 1.6
TOTAL 26c   62  
  1. aOne case refused to provide information on race or ethnicity. bDistribution of this variable cannot be meaningfully evaluated because of matching across counties. cNo matched controls were recruited for one case; only 25 were analyzed further