<p>Bars represent 95% confidence intervals. Dashed lines correspond to an incidence rate of 25%. * 95% confidence interval omitted because category included only one person. ** For the risk stratification instruments of Inouye (1993), Marcantonio (1994), Pompei (1994), Martinez (2012), and Kobayashi (2013) the cut-off point was defined by the authors of the original study. For the definition of the cut-off points of the other risk stratification instruments, see text. For the number of persons per risk score, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0113946#pone.0113946.s002" target="_blank">Table S2</a>.</p
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