. 2022 Apr 5;10:e13216. doi: 10.7717/peerj.13216

Table 15. Regression models of the performance in the different physical fitness tests in the 15-years-old group.

Age group	Variable	Analysis	R2	p value	Included independent variables	SC	Equation
15 years old	Long jump	Model 1	0.40	0.016	Fat mass (%)	−0.47	Long jump = 2.555 − 0.025*fat mass (%)
				Model 2	0.59	0.008	Fat mass (%)	−0.53	Long jump = 1.694 − 0.0.35fat mass (%) + 0.042corrected arm girth
			Corrected arm girth	Model 2	0.59	0.008	0.49
		Medicine ball throw	Model 1	0.83	<0.001	Sitting height	0.91	Medicine ball throw = −19.967 + 0.296*sitting height
		CMJ	Model 1	0.38	0.019	Fat mass (%)	−0.61	CMJ = 43.695 − 0.744*fat mass (%)
				Model 2	0.78	<0.001	Fat mass (%)	−1.04	CMJ = −73.071 − 1.259fat mass (%) + 12.495femur breadth
			Femur breadth	Model 2	0.78	<0.001	0.76		CMJ = −73.071 − 1.259fat mass (%) + 12.495femur breadth
		CMJ power	Model 1	0.87	<0.001	Biacromiale breadth	0.93	CMJ power = −1219.122 + 54.512*biacromiale breadth (kg)
				Model 2	0.93	<0.001	Biacromiale breadth	1.03	CMJ power = −2215.952 + 60.481biacromiale breadth + 17.659muscle mass (%)
			Muscle mass (%)	Model 2	0.93	<0.001	0.27
		20 m sprint	Model 1	0.48	0.006	∑8 skinfolds	0.69	Sprint = 3.400 + 0.004* ∑8 skinfolds
				Model 2	0.65	0.003	∑8 skinfolds	1.02	Sprint = 4.401 + 0.006* ∑8 skinfolds − 0.058*biileocrestal breadth
	Biileocrestal breadth		−0.52	Model 2	0.65	0.003

Notes.