Validation of an 18-item version of the Swedish Knee Self-Efficacy Scale for patients after ACL injury and ACL reconstruction

Table 3 Cronbach’s α at 11 follow-ups for patients with an ACL injury and after ACL reconstruction

Follow-ups	n	Cronbach’s α
		K-SES₁₈	K-SES₁₈
		present	future
10 weeks after ACL injury	228	0.96	0.85
4 months after ACL injury	206	0.95	0.85
8 months after ACL injury	167	0.95	0.88
12 months after ACL injury	133	0.96	0.87
18 months after ACL injury	88	0.95	0.91
Preoperative^a	388	0.95	0.82
10 weeks after ACL reconstruction	913	0.93	0.82
4 months after ACL reconstruction	929	0.93	0.81
8 months after ACL reconstruction	877	0.94	0.81
12 months after ACL reconstruction	715	0.95	0.83
18 months after ACL reconstruction	438	0.95	0.84

ACL injury refers to patients treated with rehabilitation, ACL reconstruction refers to patients treated with reconstruction and rehabilitation, K-SES₁₈ the 18-item version of the Knee Self-Efficacy Scale
^aFollow-up performed within 6 weeks before ACL reconstruction