Table 5 Jonckheere-Terpstra test for Parkland Grading Scale grades with respect to surgical difficulty scores
PGSa | N | Surgical difficulty score | Z-value | p-value | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
0 | 1 | 2 | 3 | 4 | 5 | 6 | Median | Mean rank | ||||
Grade 1 | 56 | 1 | 45 | 7 | 3 | 0 | 0 | 0 | 1 | 48.38 | 20633.00 | < 0.01 |
Grade 2 | 57 | 0 | 2 | 48 | 5 | 2 | 0 | 0 | 2 | 123.45 | ||
Grade 3 | 86 | 0 | 9 | 44 | 12 | 21 | 0 | 0 | 2 | 145.28 | ||
Grade 4 | 34 | 0 | 0 | 14 | 7 | 11 | 1 | 1 | 3 | 176.81 | ||
Grade 5 | 28 | 0 | 0 | 4 | 3 | 19 | 2 | 0 | 4 | 212.13 | ||