Table 6

Environmental factors

n

mean (SD) or %

univariate

multivariate

D

ND

D

ND

P*

OR (CI)

OR (CI)

admission via emergency room

60/118

119/259

51%

46%

0.22

1.22 (0.79 to 1.88)

admission via transfer

36/118

47/259

31%

18%

0.006

1.98 (1.20 to 3.28)

open room in intensive care

52/149

98/359

35%

27%

0.055

1.43 (0.95 to 2.15)

isolation

16/155

11/368

10%

3%

0.001

3.74 (1.69 to 8.25)

2.89 (1.00 to 8.36)

no visible daylight

70/155

118/368

45%

32%

0.003

1.75 (1.19 to 2.56)

2.39 (1.28 to 4.45)

no clock present or visible

19/155

36/368

12%

10%

0.243

1.29 (0.71 to 2.33)

number of visitors

88

168

2.4 (1.9)

2.5 (2.0)

0.70

0.97 (0.85 to 1.11)

no visit

27/96

21/173

28%

12%

0.001

2.83 (1.50 to 5.36)

3.73 (1.75 to 7.93)

physical restraints

25/66

4/226

38%

2%

<0.001

33.84 (11.19 to 102.36)

Continuous variables are presented in number, mean and standard deviation (SD); categorical variables are presented in number per group and percentage.

* P value of difference in groups, calculated with independent samples t-test for continuous variables, with Chi squared for categorical variables.

CI = confidence interval; D = delirium group; ND = non-delirium group; OR = odds ratio.

Van Rompaey et al. Critical Care 2009 13:R77   doi:10.1186/cc7892