[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