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Table 1 Description of population and relevant risk factors for delirium.

From: The effect of earplugs during the night on the onset of delirium and sleep perception: a randomized controlled trial in intensive care patients

   

Study Group

N= 69

Control Group

N= 67

P-value

Patient

age

years, mean (range)

57 (19 to 81)

62 (18 to 84)

0.57

characteristics

gender

male

68.1%

64.2%

0.72

 

education

university

7.2%

11.9%

0.07

  

college

40.6%

19.4%

 
  

high school

42.0%

55.2%

 
  

other

10.1%

13.4%

 
 

smoking

daily smoking

20.3%

23.9%

0.68

  

number of cigarettes per day when smoking

17.4

11.8

0.14

 

alcohol

regular use

46.4%

40.3%

0.49

  

number of units/week when regularly use

6.7

5.8

0.65

 

living single at home

yes

18.8%

28.4%

 
 

professionally active

yes

46.4%

31.3%

0.01

 

kids

yes

73.9%

73.1

0.92

Chronic pathology

≥ 1 Comorbidity

yes

68.1%

75.8%

0.32

Acute illness

TISS 28

mean (range)

24.5 (9 to 40)

24.5 (11 to 43)

0.74

 

SOFA score first 24 hrs

mean (range)

7.2 (1 to 14)

7.0 (2 to 15)

0.65

 

SAPS 3 score

mean (range)

42.5 (0 to 78)

42.1 (0 to 78)

0.89

 

admission

surgery

69.6%

79.1%

0.20

  

internal medicine

30.4%

20.9%

 
  

emergency surgery versus scheduled research

21.6%

29.7%

0.30

 

first time intensive care

yes

65.2%

44.8%

0.02

 

Maximal RIFLE

No acute kidney injury

3.1%

9.5%

0.22

 

score during study

risk

9.2%

3.2%

 
  

injury

20.0%

15.9%

 
  

failure

67.7%

71.4%

 
 

SLEDD necessity

Number of patients

4

5

0.52

 

length in study

mean hours of observation per patient (SD)

42.8 (25.7)

32.6 (25.7)

0.02

Environment

intensive care unit

study unit 1

21.7%

17.9%

0.57

  

study unit 2

21.7%

26.9%

 
  

study unit 3

29.0%

20.9, %

 
  

study unit 4

27.5%

34.3%

 
 

visible clock

yes

95.7%

89.6%

0.17

 

visible daylight

yes

60.9%

67.2%

0.45

 

isolation

yes

2.9%

6.0%

0.38

 

no visit

yes

0.0%

4.5%

0.12

 

room

open

39.1%

56.7%

0.12

  

separated by walls, open end

18.8%

11.9%

 
  

closed box

42.0%

31.3%

 
  1. P-value was calculated using independent-samples T test, Mann Whitney U test or Chi square where appropriate. N, number; RIFLE, Risk, Injury, Failure, Loss and End Stage; SAPS 3, Simplified Acute Physiology Score 3; SLEDD, sustained low-efficiency daily dialysis; SOFA, Sepsis-related Organ Failure Assessment; TISS 28, Therapeutic Intervention Scoring System.