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Table 1 Comparisons of R2* values at different stages using the Mann-Whitney U test

From: Evaluating the diagnostic significance of the R2* value on 3.0T MRI for assessing the severity of warm hepatic ischemia-reperfusion injury

Staging of WHIRI

Cases

Mean R2*

Z

P

S0

10

105.96 ± 10.09

-4.535

< 0.001

≥S1

40

143.46 ± 24.77

≤S1

20

115.99 ± 12.88

-4.673

< 0.001

≥S2

30

149.27 ± 26.02

≤S2

30

119.79 ± 12.75

-5.406

< 0.001

≥S3

20

160.21 ± 24.89

≤S3

40

124.09 ± 13.75

-4.851

< 0.001

S4

10

183.44 ± 7.66

  1. Notes: The severity of WHIRI was defined in the normal control and experimental groups subjected to 10, 20, 30, or 40 min of warm ischemia was defined as stages S0, S1, S2, S3, and S4, respectively