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Table 1 Characteristics of critically ill patients who survived to hospital discharge.

From: Risk factors for dementia after critical illness in elderly medicare beneficiaries

  ICU Cohort (n= 25,368)
  Number (%)
Index Hospitalization  
   Age, years: mean ± SD 76.6 ± 6.8
   Female 13,275 (52.3)
   Race  
non-Hispanic, white 22,602 (89.1)
non-Hispanic, black 1,830 (7.2)
Hispanic 407 (1.6)
Other 529 (2.1)
   ICU length of stay, days: median (IQR) 2 (1 to 5)
   Hospital length of stay, days: median (IQR) 6 (3 to 10)
   Mechanically Ventilated  
None 23,067 (90.9)
Mechanically Ventilated 2,301 (9.1)
Past Hospitalization History (prior year)  
   Any previous ICU admission 624 (2.5)
   Any previous hospitalization 4,590 (18.1)
   Number of previous hospitalizations  
0 20,778 (81.9)
1 3,035 (12.0)
2+ 1,555 (6.1)
Prior Diagnoses (prior year) a  
   None 8,450 (33.3)
   Any potential risk factors for dementia 16,918 (66.7)
Follow-Up  
   Total follow-up time, years 63543
   Average follow-up time, years: mean ± SD 2.5 ± 0.9
   Diagnosis of Dementia 4,519 (17.8)
   Mortality  
1 year 3,461 (13.6)
2 year 5,836 (23.0)
3 year 7,746 (30.5)
  1. aBased on ICD-9-CM codes. Full list of diagnoses are available in the Additional file 1. ICD-9-CM, International Classification of Diseases, 9th revision, clinical modification.