Table 5. One-way ANOVA of the percentages of force degradation after 3 weeks for the coil spring group .
| Test | Sum of Suares | Df | Mean Square | F | Sig. |
| Between groups | 80.909 | 3 | 26.970 | 1.900 | .147 |
| Within groups | 510.986 | 36 | 14.194 | ||
| Total | 591.895 | 39 |
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