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Table 2 Intra-operative and post-operative blood loss by temperature category immediately post-operatively

From: Blood loss in primary total knee arthroplasty—body temperature is not a significant risk factor—a prospective, consecutive, observational cohort study

Outcome

Low temperature group (<36.0 °C) n = 26

Low normal temperature group (36.0 °C–36.5 °C) n = 51

Normal temperature group (>36.5 °C) n = 24

p values*

Mean blood volume loss mL (SD)

Surgeon A

218 (184)

155 (269)

137 (199)

0.77, 0.93

 

Surgeon B

130 (179)

90 (324)

125 (456)

 

Overall

140 (205)

101 (300)

133 (302)

Mean haemoglobin loss g/L (SD)

Surgeon A

22.2 (11.8)

26.7 (11.1)

24.1 (6.8)

0.39, 0.53

 

Surgeon B

31.1 (10.9)

30.9 (10.0)

25.0 (9.7)

 

Overall

26.4 (12.0)

28.7 (10.7)

24.5 (7.7)

Mean drain volume mL (SD)

Surgeon A

51 (69)

75 (77)

90 (73)

0.70, 0.48

 

Surgeon B

389 (189)

348 (196)

493 (105)

 

Overall

213 (220)

235 (208)

260 (213)

  1. Surgeon A used intramedullary instrumentation, surgeon B used computer navigation
  2. *p values are for the comparison between (a) low temperature and normal temperature groups and (b) low normal temperature and normal temperature groups