Editorial: Crohn's disease: what do recurrence rates mean?
IT would seem at first glance that comparison of therapies for diseases resulting in death over a period of years should be an easy task for physicians. That it has not proved to be so is evident from the most casual reading of the cancer literature, or that related to heart disease. In 1950 Berkson and Gage1 made an important step forward in evaluating survival of patients with cancer by employing an adaptation of the life-table concept, so that at each year after diagnosis, or therapeutic intervention, the number of persons alive could be calculated, and thereby the population at . . .