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| Variables | Control Group (n = 6) | Experimental Group (n = 5) | ||
| M | SD | M | SD | |
| Age | 12.83 | 0.75 | 13.00 | 0.71 |
| Years of practice in tennis | 6.50 | 1.05 | 6.80 | 0.83 |
| Years of competition in tennis | 3.67 | 0.52 | 3.60 | 0.54 |
