Of 156 women with myocardial infarction,26 were current OC users, at their time hospital admissions,of the 3120 control women MI,304 were current OC users, calculate the measures of association??????

To calculate the measures of association, we can use the odds ratio (OR) and the relative risk (RR).

First, let's calculate the odds ratio (OR):

The odds of having a myocardial infarction (MI) among current oral contraceptive (OC) users in the case group is 26/130 = 0.2.
The odds of having a myocardial infarction (MI) among current oral contraceptive (OC) users in the control group is 304/2816 = 0.108.
Therefore, the odds ratio (OR) is (0.2 / (1 - 0.2)) / (0.108 / (1 - 0.108)) = 1.25.

Next, let's calculate the relative risk (RR):

The risk of having a myocardial infarction (MI) among current oral contraceptive (OC) users in the case group is 26/156 = 0.1667.
The risk of having a myocardial infarction (MI) among current oral contraceptive (OC) users in the control group is 304/3120 = 0.0974.
Therefore, the relative risk (RR) is 0.1667 / 0.0974 = 1.71.

So, the measures of association are:
- Odds Ratio (OR) = 1.25
- Relative Risk (RR) = 1.71