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

BMC Public Health

Table 1 Gastrointestinal illness case definitions: US studies

		Case definition¹
Definition	Description	Diarrhea	Vomiting	Stomachache	Nausea
US PHS McCabe [9]	Gastrointestinal Illness	Any	Any	Any	Any
EPA-1986 Cabelli [10]	Highly Credible Gastrointestinal Illness	w/fever or disabling	Any	w/fever	w/fever
NEEAR Wade et al. [35]	Gastrointestinal Illness	3 episodes in 24 h.	Any	Disabling or with nausea	Disabling or with stomachache

¹Presence of any single symptom. Any indicated, concomitant condition (e.g. “w/fever”) is required to be present in addition to the primary symptom.

ISSN: 1471-2458