RT Journal A1 Pinski G T1 INcorrect use of percentages JF Archives of Internal Medicine JO Archives of Internal Medicine YR 1979 FD April 1 VO 139 IS 4 SP 492 OP 492 DO 10.1001/archinte.1979.03630410096040 UL http://dx.doi.org/10.1001/archinte.1979.03630410096040 AB To the Editor.—  I call your attention to the incorrect use of percentages in the editorial "Estrogen Therapy and Endometrial Carcinoma," which appeared in the Archives (138:526-527, 1978). The studies mentioned in the editorial showed a four- to 14-fold risk (or a 400% to 1,400% risk), not a 4% to 14% greater risk. Similarly, for cigarette smoking and lung cancer, there is a nine- to 20-fold risk, not a 9% to 20% greater risk as quoted. I hope that your readers do not take literally this trivialization of the large relative risks involved.