Effect of duration of NSAID prescriptions (in years) on the risk of developing prostate cancer.

a) For each class, results from two separate models are reported. In one model, the duration of use categories were entered as an ordinal variable (a linear term). In the second model, each level of the ordinal duration of use variable was represented in the model with a binary indicator variable. In the analyses shown in the left panel, the reference group is men who did not fill any prescriptions of the index class (never-users).b) Adjusted for ever having visited a urologist 1–11 years prior, SCREENED and volume of family physician visits in the 5 years prior to the index date, and for all NSAID classes listed in the table.c) iOR: Incremental OR.