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Table 1 Preoperative and intraoperative characteristics of the patients

From: Multiple intravenous tranexamic acid doses in total knee arthroplasty in patients with rheumatoid arthritis: a randomized controlled study

Variable

Mean ± SD

Group A

(n = 48)

Group B

(n = 49)

P-value

Patient characteristics

 Age (y)

66.4 ± 5.9

66.5 ± 5.5

0.921a

 Gender (male/female),

4/44

6/43

0.529b

 Body mass index (kg m−2)

21.8 ± 3.4

22.4 ± 3.1

0.397a

 Patient blood volume (mL)

3487.7 ± 512.9

3525.3 ± 520.5

0.721a

Preoperative laboratory values

 Hematocrit (%)

36.1 ± 3.2

36.9 ± 3.7

0.215a

 Hemoglobin (g/L)

117.5 ± 13.9

119.2 ± 14.8

0.565a

 Platelets (×  109/L)

232.6 ± 60.6

226.3 ± 60.2

0.605a

 D-dimer (mg/L)

1.1 ± 0.6

1.0 ± 0.5

0.623a

 Activated partial thromboplastin time (s)

26.3 ± 4.0

25.9 ± 3.6

0.685a

 Fibrinogen (g/L)

3.6 ± 0.9

3.7 ± 1.1

0.608a

 Prothrombin time (s)

11.5 ± 0.8

11.3 ± 0.6

0.191a

 International normalized ratio

1.0 ± 0.1

1.0 ± 0.1

0.294a

 Erythrocyte sedimentation rate (mm/h)

38.0 ± 18.8

37.1 ± 19.8

0.819a

 C-reactive protein (mg/L)

11.2 ± 7.3

11.4 ± 6.4

0.902a

 Intraoperative blood loss (mL)

34.8 ± 6.8

34.5 ± 7.1

0.842a

  1. aTwo independent sample t tests
  2. bPearson’s chi-square test