Table 4. Average cost for emergency department visits and hospitalizations, by underlying condition^a.

	Emergency department visit ($)	Hospitalization ($)	Average length of stay (d)
No underlying condition	213	3,131	5
Underlying condition, other than AIDS	265	5,520	7
AIDS	NA	17,388	16
All conditions	224	6,312	8

^aCosts in 1993 United States dollars.
¹In 1998, the City of Milwaukee completed an $89 million renovation of two municipal water treatment plants, which together serve approximately 800,000 people, as part of an effort to control future outbreaks of Cryptosporidium (22).