A predictive scoring system for postoperative delirium in the elderly patients with intertrochanteric fracture

BMC Surgery

Table 1 Univariate analysis of related variables of predicting postoperative delirium

Variables	Delirium group (N = 23)	Non-delirium group (N = 136)	P value
Age, year			0.012
≤ 75 yrs	7	81
> 75 yrs	16	55
Gender, n			0.653
Male	13	67
Female	10	69
Fracture classification (Evens), n			0.972
I	4	26
II	4	27
III	5	34
IV	6	31
V	4	18
BMI, Kg/m²			0.173
≤ 20	17	79
> 20	6	57
Diabetes mellitus, n			0.251
Yes	6	54
No	17	82
History of stroke, n			0.007
Yes	8	15
No	15	121
Preoperative albumin, g/L			0.030
≤ 35	14	47
> 35	9	89
Preoperative Hb, g/L			0.018
≤ 100	16	55
> 100	7	81
Preoperative PaO₂, mmHg			0.003
≤ 60	15	42
> 60	8	94
Time between admission to surgery, day			0.015
≤ 3	7	82
> 3	16	54
Lower limb thrombosis, n			0.786
Yes	6	29
No	17	107
ASA grade, n			0.073
I / II	16	66
III / IV	7	70
Operative time, min	130.5 ± 30.1	122.6 ± 23.2	0.151
Operative blood loss, ml	152.7 ± 55.4	141.1 ± 27.3	0.118
Intraoperative blood transfusion, n			0.111
Yes	14	56
No	9	80

BMI, body mass index; Hb, hemoglobin; PaO₂, arterial partial pressure of oxygen; ASA, American Society of Anesthesiologists

ISSN: 1471-2482