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Table 4 Population estimates of cases and non-cases of Cryptosporidium-infection in Skellefteå between December 2010 and May 2011 divided into water supply categories

From: Early outbreak detection by linking health advice line calls to water distribution areas retrospectively demonstrated in a large waterborne outbreak of cryptosporidiosis in Sweden

Status

Category

N

SE (N)

95% CI (N)

N (%)

Non-cases

Not Abborrverket WTP

22,649

642

21,392 – 23,906

83.8

 

Abborrverket WTP

28,696

1033

26,944 – 30,994

67.3

Cases

Not Abborrverket WTP

4368

624

3145 – 5590

16.2

 

Abborrverket WTP

14,081

1019

12,084 – 16,078

32.7

  1. N number, SE standard error, CI confidence interval
  2. Based on postal questionnaire