The validity and reliability of the My Jump 2 app for measuring vertical stiffness in male college players.

3.2 Concurrent validity There was almost perfect agreement between the My Jump 2 app and the force platform measures of K vert in each group, which revealed highly significant differences with medium effect sizes (T1 30cm: ICC = 0.979 (95% CI: 0.966–0.988, P < 0.01, ES = 0.58); T2 30 cm: ICC = 0.987 (95% CI: 0.978–0.992, P < 0.01, ES = 0.58); T1 40 cm: 0.972 (95% CI: 0.954–0.983, P < 0.01, ES = 0.69); T2 40 cm: 0.985 (95% CI: 0.976–0.991, P < 0.01, ES = 0.56) ( Table 5 ).

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