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Figure 1 Risk-unadjusted survival after coronary artery bypass grafting (CABG). (A) Survival: Overall survival according to the Kaplan-Meier life table estimates. Confidence limits are one standard error. The numbers in parentheses represent the number of patients at risk entering each two-year interval. The fine dash-dot-dash line is an age-sex-race matched U.S. population life table. (B) Hazard: The instantaneous risk of death (hazard function) is depicted enclosed within confidence limits equivalent to one standard error. The rapidly declining early phase of hazard gives way to a steadily rising hazard phase after about nine months. The fine dash-dot-dash line is an age-sex-race matched U.S. population hazard function. Only at its nadir does the curve drop below that of the U.S. population for about a year.
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