<prompt> In a case-control study, all can be measured exceptRelative riskIncidenceOdds ratioCause effect relation  <response>: Relative riskincidence among exposedincidence among non exposed A typical case-control study does not provide incidence rates from which relative risk can be calculated directly because there is no appropriate denominator or population at risk to calculate these rates. In general, relative risk can be exactly determined only from a coho study. pg no:73 park 23 rd edition 