Table 3 χ2 test results of Williams classification standard of Parks-Dixon group
Groups | One months after surgery | Three months after surgery | Six months after surgery | Nine months after surgery | Twelve months after surgery |
|---|---|---|---|---|---|
Parks-Dixon group | Pearson χ2 = 19.35 | Pearson χ2 = 7.13 | Pearson χ2 = 1.62 | Pearson χ2 = 0.80 | Pearson χ2 = 0.00 |
P = 0.000 | P = 0.008 | P = 0.203 | P = 0.371 | P = 1.000 |