In the Western Cape province, 91 health-workers developed hepatitis during 2001. A case control study was set up to investigate these cases, wherein a total of 197 health-workers (including the original 91) were enrolled and studied. It was found that overall 122 had experienced a needle stick injury in the period from 1998, and 75 of these were in the original 91.

Make up a 2X2 table to show these results and then calculate an odds ratio for exposure to needle stick injury.