Fig. 2

Mean Log transformed final cost (Y axis) per procedure (X axis: 1: CABG alone; 2: 1 valve surgery; 3: CABG + 1 valve; 4: 2-valves surgery). The green line is the average mean Log transformed final cost, while the 2 red lines are the 95% confidence limits. All values by procedure type fall outside the 95% confidence limits and therefore significantly differ from the average at a P-value of at least 0.05