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Correlation of recurrence time and stage grouping after method of initial surgery was controlled
| Control variables | Correlation | P (two-tailed) | df |
| a, cells contain zero-order (Pearson) correlations; df, degree of freedom. | |||
| Nonea | −0.283 | 0.008 | 85 |
| First operation (Curettage or bone resection) | −0.310 | 0.004 | 84 |
