Figure 4.

Probability of (A) surgical intervention or (B) the development of acute urinary retention (AUR) during a 4-year study of finasteride treatment in men with benign prostatic hyperplasia. Life-table analyses of the proportion of men with each outcome are shown. The numbers of events shown below the graphs are those that occurred during each 1-year interval. The numbers of men at risk are those at the beginning of the respective 1-year intervals. Differences in the rates of surgery and AUR were evident within 4 months. Reproduced, with permission, from McConnell JD et al. N Engl J Med. 1998;338:557–563.¹⁵