<prompt> A study found Odds ratio of maternal hypeension to have IUGR fetus to be 1:5. What is the interpretation drawn ?Positive associationCommon associationInverse associationRare outcome  <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 a c b d ac bd Odds Ratio 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 Interpretation: OR 1 -- Positive association OR 1 -- No association OR 1 -- Negativeinverse association In this question, OR is 1:5, i.e, 15 0.2 hence inverse association. 