Recall how to read and explain basic 2-by-2 epidemiologic tables.
Design compare Risk ratio or odds ratio? Let the sampling design choose the measure. Formula In a cohort-style 2-by-2 table, what is exposed attack rate? a / (a + b) Cases among exposed divided by all exposed people at risk. What is the basic odds ratio cross-product? ad / bc Use when odds, not risks, are the natural comparison. Objection Most sick people were exposed, so that must be the cause. Your line We need to compare illness among exposed people with illness among unexposed people before naming the exposure. Counting exposed cases without the unexposed denominator. It redirects from…
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