Table 3. Meta-regression analysis between the demographic variables age and gender, and thigh muscle strength parameters.

Variable	Coefficient	Standard error	P value	95% confidence interval
Difference of Hamstring muscle strength between uninvolved and involved leg
Age	−0.068	1.288	0.959	−3.111 to 2.978
Gender	17.126	17.241	0.354	−23.643 to 57.895
Difference of Hamstring muscle strength between uninvolved and involved leg
Age	−0.128	0.608	0.839	−1.568 to 1.311
Gender	4.546	8.056	0.590	−14.503 to 23.597
Difference of Hamstring-to-quadriceps ratio between uninvolved and involved leg
Age	0.302	0.333	0.417	−0.624 to 1.229
Gender	−3.300	4.425	0.497	−15.588 to 8.986