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FIGURE 1. (a) Mean postoperative length of stay for 6 cardiovascular procedures, based on data from the national Medicare population (1994–1999). P < 0.05 for all differences across volume strata. (b) Mean postoperative length of stay for 8 cancer resections, based on data from the national Medicare population (1994–1999). P < 0.05 for all differences across volume strata.
