Research Article
[Retracted] Early Warning System of Tennis Sports Injury Risk Based on Mobile Computing
Table 3
Validity test of questionnaire.
| Grade | Number of people | Very effective | Effective | General | Not very effective | Invalid |
| Professor | 3 | 0 | 3 | 0 | 0 | 0 | Associate professor | 2 | 1 | 2 | 0 | 0 | 0 | Senior coach | 2 | 1 | 1 | 0 | 0 | 0 | Total | 8 | 2 | 6 | 0 | 0 | 0 | Percentage | 100% | 25% | 75% | 0 | 0 | 0 |
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