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| June | November |
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| Mean | SD | Mean | SD | F-value | Post-hoc | ||
| Softballs | 3.8 | 1.3 | 4.4 | 1.3 | F1: 17.20* | F2: 51.44* | F3: 5.29 | June: Softballs < Tennis balls; Softballs: June < November |
| Tennis balls | 4.6 | 1.5 | 4.9 | 1.7 |
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| November: Softballs < Tennis balls; Tennis balls: June < November |