Relationship between systolic blood pressure (SBP) and cardiovascular event rate (IR
). IRCVD =. The thick black, thin black, and thick gray lines represent k = 20, 30, and 40, respectively, where l = 100 and m = 140. For example, when k = 20, the IRCVD is 0.0036/year, 0.01/year, and approximately 0.027/year when SBP is 120, 140, and 160 mm Hg, respectively, and corresponds to a moderate risk in the Japanese Society of Hypertension 2009 guidelines.