Worked: Attack Rates From a Picnic Line List

A picnic line list shows 180 attendees. For salsa, 96 ate it and 24 became ill. Among 84 who did not eat it, 6 became ill. For chicken, 120 ate it and 20 became ill; among 60 who did not, 10 became ill. Attack rate = new outbreak cases among a group / people at risk in that group. Risk ratio = exposed attack rate / unexposed attack rate. Do not rank foods by the number of sick eaters. A common item can have many sick eaters even when its risk is no higher than the comparison group. Before Chicken…

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