Table 5

Frequencies and logistic regression* results: intrinsic risk factors for hamstrings and quadriceps muscle strains in professional soccer players (N=100)

Intrinsic aetiological factors	Frequencies^* (%)			Statistics
		Low risk	High risk	OR	95% CI	p Value
Hamstrings muscle strains (16 vs 84)
Eccentric hamstrings strength asymmetries	No strain	48	36	3.88	1.13 to 13.23	0.03
Eccentric hamstrings strength asymmetries	Strain	5	11	3.88	1.13 to 13.23	0.03
Functional leg length asymmetries	No strain	62	22	3.80	1.08 to 13.33	0.03
Functional leg length asymmetries	Strain	9	7	3.80	1.08 to 13.33	0.03
Previous hamstring strains	No strain	53	31	0.15^†	0.029 to 0.79	0.02
Previous hamstring strains	Strain	14	2	0.15^†	0.029 to 0.79	0.02
Quadriceps muscle strains (7 vs 93)
Weight	No strain	55	38	10.70	0.73 to 156.37	0.08
Weight	Strain	3	4	10.70	0.73 to 156.37	0.08
Height	No strain	42	51	0.08^†	0.00 to 1.35	0.08
Height	Strain	4	3	0.08^†	0.00 to 1.35	0.08
Quadriceps flexibility asymmetries	No strain	80	13	4.98	0.78 to 31.80	0.08
Quadriceps flexibility asymmetries	Strain	4	3	4.98	0.78 to 31.80	0.08
Eccentric quadriceps strength asymmetries	No strain	77	16	5.019	0.928 to 27.14	0.06
Eccentric quadriceps strength asymmetries	Strain	3	4	5.019	0.928 to 27.14	0.06

High risk (low risk): with (without): (1) preseason functional asymmetries, (2) previous muscle strains, (3) weight above (below) median and (4) height above (below) median.
Strain (no strain): with (without) muscle strain.
↵* Two separate models determined.
↵† OR<1: decreased odds of injury.