Table 5

Logistic regression model with bootstrapping (1000 samples) predicting subsequent concussion diagnosis

	B	Bias	SD	Significance	95% CI
	B	Bias	SD	Significance	Lower	Upper
Loss of consciousness/motionless	1.70	0.019	0.584	0.001	0.542	2.83
Incoordination/balance problems	1.39	0.020	0.289	0.001	0.84	1.98
Fight	1.52	0.191	1.837	0.007	0.23	3.07
Initial hit by stick	−1.44	−0.453	2.681	0.01	−3.215	−0.54
Initial hit by shoulder	0.85	0.046	0.280	0.002	0.297	1.46
Secondary contact on ice	1.62	0.027	0.425	0.001	0.822	2.50
No secondary contact	−0.09	0.002	0.281	0.746	−0.615	0.495
Constant	−2.76	−0.058	0.253	0.001	−3.35	−2.36

Per cent likelihood of concussion = (Exp ((−2.76) + (1.52 * Fight) + (0.85 * Shoulder) + (1.62 * Ice) - (1.44 * Stick) + (1.70 * LOC) – (0.09 * No secondary contact) + (1.39* Incoordination)))/ (1+ (Exp ((−2.76) + (1.52 * Fight) + (0.85 * Shoulder) + (1.62 * Ice) - (1.44 * Stick) + (1.70 * LOC) – (0.09 * No secondary contact) + (1.39 * Incoordination)))
LOC, loss of consciousness