Figure 3.

Kaplan–Meier graph demonstrating survival by MMSE group from admission through 6 months of posthospital follow-up (N = 391). Group sizes were as follows: cognitively intact, n = 127 (32.5%); minimal impairment, n = 172 (44.0%); and moderate impairment, n = 92 (23.5%). Because the intensive care unit admission date was not available in Medicare claims, the hospital admission date was used as a proxy. Follow-up extended to 210 days because each ICU admission was nested within a hospitalization, which sometimes extended beyond 30 days. MMSE = Mini-Mental State Examination.