Table 2 Factors influencing the maximum drop in hemoglobin.

From: Predictors for blood loss and transfusion frequency to guide blood saving programs in primary knee- and hip-arthroplasty

 

Maximum hemoglobin drop (g/dL)

p

Median

IQR

Drain

Yes

4.35

3.54–5.32

< 0.001

No

3.38

2.26–4.35

Tranexamic acid

Yes

3.38

2.42–4.19

< 0.001

No

4.19

2.90–5.00

Tranexamic acid

Drain

4.11

3.18–4.71

< 0.001

No drain

3.14

2.09–3.87

No tranexamic acid

Drain

4.51

3.54–5.48

No drain

3.54

2.42–4.67

Anticoagulation

Yes

4.35

3.06–5.00

0.004

No

3.54

2.50–4.59

Duration of surgery

≤ 73 min (median)

3.55

2.42–4.51

0.002

> 73 min (median)

4.08

3.06–5.00

BMI

< 28 (median)

4.03

3.06–5.00

0.024

≥ 28 (median)

3.54

2.42–4.67

ASA status

≤ 2

3.71

2.58–4.67

0.016

> 2

4.19

3.14–5.24

Mechanical heart valve

Yes

5.96

4.35–n.a.

0.034

No

3.87

2.58–4.83

  1. BMI: body mass index, ASA: American Society of Anesthesiologists graden, n.a.: not applicable.
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