Table 4.

Multilevel regression models posterior estimations and 90% credible intervals of young basketball players by gender, age group, maturity status, onset of deliberate practice, birth quarter, and by the interaction of age group and birth quarter.

	Population-level effects	Group-level effects
	Intercept	Gender	Age group	Maturity status	Onset of deliberate practice	Birth quarter	Age group, birth quarter
Countermovement jump	−0.13 (−1.05; 0.82)	0.92 (0.43; 1.56)	0.72 (0.38; 1.18)	0.28 (0.04; 0.61)	0.16 (0.01; 0.39)	0.12 (0.02; 0.27)	0.08 (0.01; 0.18)
Line drill test	0.13 (−0.73; 1.01)	0.67 (0.22; 1.31)	0.96 (0.57; 1.44)	0.18 (0.02; 0.45)	0.17 (0.02; 0.37)	0.12 (0.02; 0.27)	0.12 (0.02; 0.23)
Yo-yo intermittent recovery test level-1	−0.02 (−1.04; 0.95)	0.82 (0.36; 1.42)	0.69 (0.35; 1.13)	0.26 (0.04; 0.56)	0.47 (0.17; 0.89)	0.24 (0.04; 0.50)	0.21 (0.05; 0.37)
Performance score	−0.13 (−1.57; 1.29)	1.34 (0.78; 2.01)	1.66 (1.13; 2.25)	0.43 (0.06; 0.78)	0.38 (0.05; 0.81)	0.26 (0.03;0.57)	0.41 (0.10; 0.72)
Will to excel	−0.05 (−0.72; 0.62)	0.60 (0.16; 1.22)	0.16 (0.02; 0.34)	0.23 (0.03; 0.52)	0.28 (0.05; 0.63)	0.23 (0.04; 0.48)	0.09 (0.01; 0.20)
Will to compete	0.04 (−0.55; 0.65)	0.37 (0.03; 0.94)	0.28 (0.07; 0.57)	0.35 (0.08; 0.74)	0.25 (0.03; 0.58)	0.18 (0.02; 0.38)	0.22 (0.09; 0.36)
Mastery	0.01 (−0.65; 0.63)	0.57 (0.14; 1.17)	0.17 (0.02; 0.38)	0.27 (0.03; 0.60)	0.19 (0.02; 0.45)	0.17 (0.02; 0.45)	0.13 (0.02; 0.25)
Work	−0.03 (−0.68; 0.62)	0.53 (0.12; 1.15)	0.23 (0.04; 0.47)	0.25 (0.03; 0.62)	0.29 (0.06; 0.63)	0.23 (0.04; 0.50)	0.23 (0.09; 0.38)
Competitiveness	0.02 (−0.64; 0.70)	0.55 (0.13; 1.16)	0.26 (0.04; 0.55)	0.28 (0.03; 0.63)	0.33 (0.06; 0.71)	0.14 (0.02; 0.33)	0.13 (0.02; 0.27)
Self-referenced competencies	0.04 (−0.56; 0.63)	0.43 (0.06; 1.00)	0.15 (0.02; 0.33)	0.30 (0.05; 0.64)	0.31 (0.05; 0.67)	0.13 (0.02; 0.28)	0.14 (0.03; 0.26)
Others-referenced competencies	−0.08 (−0.76; 0.55)	0.37 (0.03; 0.95)	0.39 (0.10; 0.78)	0.28 (0.04; 0.62)	0.44 (0.12; 0.88)	0.17 (0.02; 0.39)	0.20 (0.05; 0.34)
Effort expenditure	−0.03 (−0.59; 0.56)	0.23 (0.03; 0.52)	0.40 (0.04; 1.00)	0.22 (0.02; 0.53)	0.25 (0.03; 0.60)	0.18 (0.02; 0.40)	0.32 (0.18; 0.48)
Positive parental involvement	−0.01 (−0.74; 0.65)	0.57 (0.14; 1.15)	0.32 (0.10; 0.61)	0.21 (0.02; 0.52)	0.39 (0.07; 0.82)	0.17 (0.02; 0.38)	0.16 (0.02; 0.30)
Affiliation with peers	−0.04 (−0.59; 0.50)	0.16 (0.02; 0.35)	0.39 (0.05; 0.93)	0.21 (0.02; 0.49)	0.34 (0.05; 0.75)	0.14 (0.02; 0.32)	0.20 (0.05; 0.35)

Estimates in bold indicate substantial a variation at group-level on the outcome.