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Table 2 Comparison of intraoperative rSO2 between delirium and no delirium group

From: The relationship between intraoperative cerebral oximetry and postoperative delirium in patients undergoing off-pump coronary artery bypass graft surgery: a retrospective study

rSO2

No delirium(n = 710)

Delirium(n = 105)

P-values

Mean; %

55.5 ± 6.8

54.8 ± 7.74

0.32

Minimum; %

47.6 ± 8.1

46.7 ± 8.33

0.30

Mean duration of rSO2 reduction; min

  < 75%

451.0 ± 141.7

468.0 ± 175.7

0.27

  < 70%

442.0 ± 147.9

459.9 ± 182.1

0.28

  < 65%

402.3 ± 167.4

418.9 ± 195.4

0.36

  < 60%

318.2 ± 193.4

341.9 ± 230.9

0.25

  < 55%

204.1 ± 196.1

231.0 ± 230.3

0.20

  < 50%

100.9 ± 159.6

138.7 ± 202.7

0.03

  < 45%

39.3 ± 100.6

64.6 ± 141.5

0.03

  < 40%

11.7 ± 49.2

18.3 ± 82.1

0.26

  < 35%

4.0 ± 28.9

7.1 ± 50.7

0.38

Number of patients with rSO2 reduction

  < 70%

709 (99.9%)

105 (100%)

1

  < 65%

703 (99.0%)

104 (99.0%)

0.97

  < 60%

669 (94.2%)

98 (93.3%)

0.72

  < 55%

573 (80.7%)

84 (80.0%)

0.87

  < 50%

407 (57.3%)

69 (65.7%)

0.11

  < 45%

228 (32.1%)

44 (41.9%)

0.048

  < 40%

108 (15.2%)

17 (16.2%)

0.80

  < 35%

41 (5.8%)

6 (5.7%)

0.98

  1. The values are expressed as mean ± standard deviation for mean, minimum rSO2 and mean duration of rSO2 reduction, number (%) for the incidence of rSO2 reduction. rSO2 Regional cerebral oxygen saturation