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Table 1 Summary of patient characteristics

From: Room transfers and the risk of delirium incidence amongst hospitalized elderly medical patients: a case–control study

Demographic characteristic Patients who did not develop incident delirium (N = 868) Patients who developed incident delirium (N = 126) P-value
Age (mean, standard deviation) 81.0 (6.5) 82.7 (6.5) 0.0004
Female Gender (Percent) 498 (57.4 %) 67 (53.2 %) 0.37
Non-english speakers (Percent) 155 (17.9 %) 25 (19.9 %) 0.03
Mean length of stay 7.8 days 11.6 days <0.0001
Mean of the number of room transfers for patients during the period of hospitalization (SD) 1.86 (1.19) 2.67 (1.59) <0.0001
Mean number of room transfers within first week of hospital stay (SD) 1.68 (0.93) 2.21 (1.28) <0.0001
Mean number of room transfers before the onset of delirium (SD)* 1.68 (0.93) 1.60 (0.90) 0.40**
Mean number of room transfers per patient days before delirium onset (SD)*** 0.43 1.03 <0.0001
Number (percentage) of patients transferred between the emergency department and the ward 868 (100 %) 126 (100 %) -
Number (percentage) of patients transferred between the medical floor and other floors in the hospital 145 (16.71 %) 12 (9.52 %) 0.04
Number (percentage) of patients transferred between different rooms on the same floor 394 (45.39 %) 56 (44.44 %) 0.84
Number (percentage) of patients transferred between different beds in the same room 51 (5.88 %) 8 (6.35 %) 0.83
Number (percentage) of patients transferred at least once (excluding ER to ward transfer) 435 (50.12 %) 92 (73.02) <0.0001
In Total
Within the first week of Hospitalization 396 (45.62 %) 83 (67.87 %) <0.0001
Number (percentage) of patients transferred more than once (excluding ER to ward transfer) 171 (19.70 %) 57 (45.24 %) <0.0001
In Total
Within the first week of Hospitalization 135 (15.55 %) 38 (30.16 %) <0.0001
  1. * For control groups this is the same as the number of room changes within the first week
  2. ** Note that the number of transfers after onset of delirium is not included in this comparison and hence comparison is not appropriate
  3. *** Since the time periods where number of room transfers were observed are different for each patient, we adjusted it by taking the number of transfers per patient days, which is our primary outcome