The influence of maturation, fitness, and hormonal indices on minutes played in elite youth soccer players: a cross-sectional study

Table 4 Multiple linear regression analysis: minutes of playing and all variables

Variable	Beta	Estimate	\|t\|	P value	95% CI for estimated
MP (min)	β0	− 904.3	0.77	0.455	− 3415 to 1607
Skeletal Age (years)	β1	20.17	0.43	0.676	− 80.63 to 121.0
Maturity offset (years)	β2	− 160.6	1.40	0.181	− 404.7 to 83.59
Soccer training (months)	β3	− 1.9	1.09	0.292	− 5.806 to 1.870
V̇O_{2 max} (ml kg⁻¹ min⁻¹)	β4	42.8	2.72	0.016	9.324 to 76.35
Fatigue index (seconds)	β5	40.3	0.28	0.780	− 262.2 to 342.8
CMJ (cm)	β6	− 1.2	0.12	0.907	− 22.55 to 20.17
GH (ng/dl)	β7	37.9	2.32	0.035	3.034 to 72.78
IGF1 (ng/dl)	β8	0.7	1.81	0.091	− 0.1250 to 1.519
				R² = 0.76

Significant differences (p ≤ 0.05) are highlighted in bold. MP (minutes of playing); CMJ (countermovement jumps)
MP = minutes of playing; V̇O_2max = maximal oxygen consumption; CMJ = countermovement jump; GH = growth hormone; IGF1 = insulin-like growth factor; CI = confidence interval

ISSN: 2052-1847