Unstable intertrochanteric fractures are associated with a greater hemoglobin drop during the perioperative period: a retrospective case control study

Table 1 Patient demographic data

	Stable group^a	Unstable group^a	Whole cohort^a	p-value
AO classification	AO 31 A1.1 - A2.1	AO 31 A2.2 - A2.3	–
Number of patients	40	36	76
Sex			–	0.70
Male	15	12
Female	25	24
Age (years);			Mean age: 80.56 years	0.91
60 ≤Age≤ 70	3	3
70 <Age≤ 80	16	12
80 <Age≤ 90	21	21
Hb (g/dl)
Preoperative Hb	11.82	12.51	12.1	0.08
Postoperative Hb	8.93	9.12	9.0	0.62
Hb drop	2.89	3.39	3.1	0.04*
Time between injury and surgery				0.77
< 24 h	37	32	18
> 24 h	3	4
Duration of operation;				0.33
Time < 60 min	14	10
60 min ≤Time< 120 min	22	22	78.5
Time ≥ 120 min	4	4
T-score			–	0.15
No record	6	9
T-score ≥ -1	5	1
-2.5 ≤T − score< -1	11	18
T-score < -2.5	18	8
ASA classification			–	0.41
2	2	5
3	38	30
4	0	1
BMI (kg/m²);			23.14	0.58
BMI < 18.5	5	5
18.5 ≤BMI< 24	22	17
BMI ≥ 24	13	14
Anticoagulant use			–	0.94
Yes	1	1
No	39	35

Abbreviations: ASA American Society of Anesthesiologists, BMI Body mass index, Hb Hemoglobin
Definitions: Stable group = AO 31 A1.1-A2.1, Unstable group = AO 31 A2.2–2.3, Preoperative Hb = first hemoglobin data recorded in emergency room
Postoperative Hb = hemoglobin data recorded in the morning after surgery,
*p < 0.05
^aMean values for each parameter are listed

ISSN: 1471-2474