TABLE 2.

Multiple regression results.

	Regression model
	Stepwise		Linear	Lasso	Ridge
Variables	Std β	t	Std β	Std β	Std β
Age	−0.64	−11.77	−0.64	−0.62	−0.46
Body mass	−0.23	−8.46	−0.23	−0.23	−0.05
Body fat	0.33	5.70	0.33	0.33
VO2max (ml⋅kg–1⋅min–1)	−0.38	−1.96	−0.38	−0.32	0.03
Fitness level	0.44	2.28	0.02	0.37
Sex	8.74	6.13	8.74	8.32
Test modality	0.97	2.16	0.97	0.97
BMI			0.02	0.02
Regression parameters
Intercept	229		229	225	202
R 2	0.22		0.22	0.22	0.20
MAE	7.04		7.04	7.04	7.11
Lambda				0.0002	0.45

BMI, body mass index, VO₂max, maximum oxygen uptake; Std β, standardized β coefficient; MAE, mean absolute error.