Study on risk factors and interaction effects of delirium in patients with severe pneumonia in intensive care unit

Table 1 Comparison of general data, mean ± SD/n (%)

Index	Delirium group (n = 71)	Non-delirium group (n = 203)	χ2/t value	P value
Age (year)	48.10 ± 3.58	47.71 ± 3.41	0.807	0.420
Gender			1.392	0.238
Male	39 (54.93)	95 (46.80)
Female	32 (45.07)	108 (53.20)
BMI (kg/m2)	21.94 ± 1.28	22.10 ± 1.14	-1.005	0.316
Type of pneumonia (cases)			2.832	0.092
Community-acquired pneumonia	45 (63.38)	150 (73.89)
Hospital-acquired pneumonia	26 (36.62)	53 (26.11)
Smoking (cases)	30 (42.25)	76 (37.44)	0.514	0.473
Drinking (cases)	18 (25.35)	35 (17.24)	2.218	0.136
Previous history
Hypertension	24 (33.80)	59 (29.06)	0.559	0.455
Diabetes	18 (25.35)	22 (10.84)	8.889	0.003
Coronary heart disease	21 (29.58)	51 (25.12)	0.539	0.463
Insomnia	32 (45.07)	97 (47.78)	0.155	0.693
Course (day)	19.61 ± 0.67	19.43 ± 0.72	1.760	0.079
Mechanical ventilation time (hour)	191.09 ± 43.75	136.74 ± 40.92	9.460	< 0.001
WBC (× 109/L)	13.37 ± 2.16	12.89 ± 2.55	1.420	0.157
Platelet (× 109/L)	172.71 ± 35.06	181.63 ± 37.22	-1.763	0.079
Serum creatinine (μmol/L)	86.73 ± 25.59	83.26 ± 25.21	0.993	0.322
Lactic acid (mmol/L)	5.14 ± 1.55	2.91 ± 0.74	15.982	< 0.001
Urea nitrogen (mmol/L)	11.91 ± 3.29	11.23 ± 3.38	1.476	0.141
Hemoglobin (g/L)	98.72 ± 19.27	100.67 ± 25.37	-0.592	0.554
Calcium (mmol/L)	2.23 ± 0.15	2.36 ± 0.09	-8.889	< 0.001
Sodium (mmol/L)	139.13 ± 3.32	138.56 ± 3.41	1.227	0.221
Potassium (mmol/L)	3.89 ± 0.40	3.91 ± 0.42	-0.426	0.670
CRP (mg/L)	127.47 ± 37.67	121.01 ± 36.18	1.282	0.201
Arterial oxygen saturation			11.286	0.001
< 90%	41 (57.75)	71 (34.98)
≥ 90%	30 (42.25)	132 (65.02)
APACHE II			17.749	< 0.001
< 15	37 (52.11)	159 (78.33)
≥ 15	34 (47.89)	44 (21.67)
Sedatives			0.189	0.664
Yes	36 (50.70)	109 (53.69)
No	35 (49.30)	94 (46.31)
Nutritional risk			0.362	0.547
Yes	16 (22.54)	39 (19.21)
No	55 (77.46)	164 (80.79)

BMI: Body mass index; WBC: White blood cell; CRP: C-reactive protein; APACHE II: Acute Physiology and Chronic Health Evaluation II.