Fig. 2. Adjusted hazard ratios for the association between duration of intraoperative hypotension and all-cause 1-yr mortality plotted against absolute ( A and C ), relative ( B and D ), systolic ( A and B ), and mean ( C and D ) blood pressure threshold values for intraoperative hypotension. The dotted lines represent the 95% confidence interval. The horizontal dotted line represents the level of no effect (hazard ratio = 1).