Table 2

Factors associated with delirium in univariate analysis

VariablesN=87With delirium (n=19)Without delirium (n=68)OR (95% CI)P value
Age (years)0.142
 ≤404212 (28.6%)30 (71.4%)2.17 (0.76 to 6.19)
 >40457 (15.6%)38 (84.4%)Ref
Gender14 (20.6%)0.593
 Male685 (26.3%)54 (79.4%)0.726 (0.22 to 2.36)
 Female1914 (73.7%)Ref
BMI (kg/m2)0.51
 ≥25479 (19.1%)38 (80.9%)0.71 (0.26 to 1.97)
 <254010 (25%)30 (75%)Ref
COPD0.0005*
 Yes1310 (76.9%)3 (23.1%)24.07 (5.55 to 104.33)
 No749 (12.2%)65 (87.8%)Ref
Intubation0.677
 Yes7818 (23.1%)60 (76.9%)2.4 (0.28 to 20.49)
 No91 (11.1%)8 (88.9%)Ref
Fever0.009*
 Yes2510 (40%)15 (60%)3.92 (1.35 to 11.42)
 No629 (14.5%)53 (85.5%)Ref
Infection0.85 (0.27 to 2.69)0.792
 Yes255 (20%)20 (80%)Ref
 No6214 (22.6%)48 (77.4%)
Pain ≥40.0005*
 Yes1911 (57.9%)8 (42.1%)10.31 (3.19 to 33.29)
 No688 (11.8%)60 (88.2%)Ref
Agitation0.0005*
 Yes4017 (42.5%)23 (57.5%)16.63 (3.53 to 78.26)
 No472 (4.3%)45 (95.7%)Ref
Sedation0.024*
 Yes5416 (29.6%)38 (70.4%)4.21 (1.12 to 15.80)
 No333 (9.1%)30 (90.9%)Ref
Hypernatremia (serum sodium ≥145)0.0005*
 Yes4216 (38.1%)26 (61.9%)8.61 (2.28 to 32.46)
 No453 (6.7%)42 (93.3%)Ref
Serum creatinine ≥1.20.142
 Yes457 (15.6%)38 (84.4%)0.46 (0.16 to 1.31)
 No4212 (28.6%)30 (71.4%)Ref
Length of ICU stay (days)0.022*
 <7 days568 (14.3%)48 (85.7%)Ref
 ≥7 days3111 (35.5%)20 (64.5%)3.3 (1.16 to 9.43)
Length of hospital stay0.291
 ≤10324 (12.5%)28 (87.5%)Ref
 11–304412 (27.3%)32 (72.7%)2.63 (0.76 to 9.07)
 >30113 (27.3%)8 (72.7%)2.63 (0.48 to 14.23)
Mortality0.0005*
 Yes2111 (52.4%)10 (47.6%)7.97 (2.57 to 24.72)
 No668 (12.1%)58 (87.9%)Ref
  • * p value<0.05

  • *p value <0.05

  • BMI, body mass index; COPD, chronic obstructive pulmonary disease; ICU, intensive care unit.