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Table 7 Mantel-Haenszel test for a linear trend between the Parkland Grading Scale and morbidity scores

From: Can the parkland grading scale predict the difficulty of laparoscopic cholecystectomy? A new approach to validation

Morbidity Score

N

PGSa

x2

p-value

 

1

2

3

4

5

  

0

248

56

55

82

31

24

10.0937.467

0.006

1

3

0

0

1

2

0

2

2

0

0

1

1

0

3

6

0

2

1

0

3

4

1

0

0

0

0

1

5

1

0

0

1

0

0

  1. a Parkland Grading Scale