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Comparison in gradient of flattening between different zones
| Groups | Mean±SD | Median | Min, Max | P |
|---|---|---|---|---|
| Zone A | 9.99±3.26 | 10.75 | 4.3, 14.5 | 0.000** |
| Zone B | 6.06±2.30 | 5.65 | 2.6, 11.2 | |
| Zone B | 6.06±2.30 | 5.65 | 2.6, 11.2 | 0.000** |
| Zone C | 2.53±1.03 | 2.40 | 0, 6.1 | |
| Zone C | 2.53±1.03 | 2.40 | 0, 6.1 | 0.000** |
| Zone A | 9.99±3.26 | 10.75 | 4.3, 14.5 |
**P<0.01 (Mann–Whitney U test)
