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. Author manuscript; available in PMC: 2019 Aug 1.
Published in final edited form as: Med Care. 2018 Aug;56(8):701–710. doi: 10.1097/MLR.0000000000000947

FIGURE 1. Kaplan-Meier Plots of Survival after Admission in Multimorbid and Non-Multimorbid Matched General Surgery Patients in Low-Volume and High-Volume Hospitals.

FIGURE 1

Each matched pair contained one patient from a high-volume hospital and one from a low-volume hospital (N=3,151 MM pairs and N=6,387 non-MM pairs), matched exactly on 135 principal procedures and whether or not the patient was multimorbid, and further matched on risk of mortality on admission, a propensity score for admission to a low-volume hospital, demographics, admission type, 29 comorbidities, and 113 individual qualifying comorbidity sets.