<prompt> Cross product ratio is used in:-Cross- sectional studyCase control studyCoho studyEcological study  <response>: Framework of a case control study The 2 x 2 contigency table Suspected or risk factors Cases Disease present Control Disease absent Present Absent ac bd ac bd Cross product ratio is another name for Odds ratio. It used to calculate strength of association between risk factor and outcome in case of case control studies. Odds Ratio OR a x db x c Since it involves cross multiplying the values in the 2x2 Contingency table, it is called cross product ratio In coho study , Relative Risk or Risk Ratio is determined Cross sectional studies deal with determining prevalence of disease Ecological study is used to determine correlation 