Table 4: Significance of risk factors in a logistic regression with previous injury as a confounder.

Variable	Coefficient	p-value	R2 (Nagelkerke)
Sex=male	-0.42	0.57	0.25
Relative external rotation strength	-4.54	0.23	0.28
Relative internal rotation strength	-0.72	0.78	0.24
Ratio external/internal rotation strength	-7.07	0.08	0.34
External rotation flexibility	-0.01	0.92	0.24
Internal rotation flexibility	-0.05	0.15	0.30
Total rotation flexibility	-0.03	0.22	0.28
External rotation gain	0.03	0.51	0.25
Internal rotation loss	0.07	0.17	0.29
Scapular upward rotation	0.39	0.01	0.47

Previous injury was entered as the first confounder, and then a separate model was created with each variable above.