Questions 16-23. A 24-month prospective cohort study was done to examine the association between oral contraceptive use (OCP) and the development of deep vein thrombosis (DVT) among 1,150 women of child-bea ring age. There were no losses to follow up but not oh' women were enrolled during the rst month of the study, so each of them was followed-up for variable period. The following results were obtained. Answer the questions based on the table below. (16 points) Number of Total Person Number of new DVT cases participants enrolled Months by 24 months at baseline