Table 3 Classification and regression tree analysis with four different follow-up times for players with ACLR (n = 112)

Secondary ACL injury, n (%)

17 (15)

28 (25)

35 (31)

43 (38)

Sensitivity, %

94

96

77

88

Specificity, %

81

70

80

78

Overall correct classification, %

83

77

80

82

Accuracy, %

93

86

86

87

1. Time between injury and ACLR, months

2

2

2. Level of play, n (%)

3. IKDC (0–100)

4

4. ACL-RSI (0–10)

1

5. ACL-QoL (0–10)

3

3 and 5

6. SMPS—personal standards (1–5)

7. SSP—somatic anxiety (0–100)

4

8. SSP—psychic anxiety (0–100)

3

9. SSP—stress susceptibility (0–100)

3

1

10. SSP—impulsiveness (0–100)

2

3 and 4

11. SSP—adventure seeking (0–100)

12. Ankle dorsiflexion, side difference, degrees

13. Knee extension ACLR leg, degrees

5

1

1

14. LSI—single hop for distance, %

15. LSI—side hop, %

5

4

3

16. 5-jump test, cm

2

2 and 5

2

17. Tuck jump (0–10)

3

18. Knee collapse ACLR leg in DVJ, cm

19. Knee collapse non-ACLR leg in DVJ, cm

7: ACL-RSI, SSP-impulsiveness, SSP-stress susceptibility, and IKDC

4.62 (2.04–10.47)

10: ACL-RSI, SSP-impulsiveness, SSP-stress susceptibility, and IKDC

8.16 (3.97–16.78)

13: SSP- stress susceptibility, time between injury and ACLR, SSP-impulsiveness, and knee extension ACLR leg

7.67 (3.15–18.64)

4: Knee extension ACLR leg and 5-jump test

3.39 (2.28–5.05)

14: Knee extension ACLR leg, 5-jump test, SSP-psychic anxiety, and LSI-side hop

2.70 (1.62–4.50)

12: Knee extension ACLR leg, time between injury and ACLR, LSI-side hop and SSP-somatic anxiety

3.73 (2.25–6.19)

14: Knee extension ACLR leg, time between injury and ACLR, LSI-side hop, SSP-somatic anxiety, and ACL-QoL

2.11 (1.31–3.39)