Using the information in Table 1, a) calculate the strata specific (=40) odds ratios for the association between oral contraceptive use and ovarian cancer and b) calculate the crude odds ratio for the association between oral contraceptive use and ovarian cancer. Do these calculations support that age is a potential confounder of the relationship between oral contraceptive use and ovarian cancer? Case Control Age =40 OC Use No OC use Total OC Use No OC use 4. What is the OR for