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Table 2 Effect of case definition on gastrointestinal illness rate

From: Equivalency of risk for a modified health endpoint: a case from recreational water epidemiology studies

Reference Study Case definition1 Non-swimmer illness rate per 1000
   Diarrhea Vomiting Stomachache Nausea
Wiedenmann [25] UK2 3 episodes in 24 hours Any w/fever w/fever 14
  UKwf3 Any Any w/fever w/fever 28
  NL24 Any Any Any Any 52
van Asperen [26] USEPA5 w/fever or disabling Any w/fever w/fever 8
  UK2 3 episodes in 24 hours Any w/fever w/fever 17
  NL24 Any Any Any Any 21
  1. 1Presence of any single symptom. Any indicated concomitant condition (e.g. “w/fever”) is s required to be present in addition to the primary symptom. 2 Kay, [27]. 3 Wiedenmann, [25]. 4 van Asperen, [26]. 5 Cabelli, [10].