Table 1. Overview of relevant design features of existing research on the prognostic value of psychological factors.

Participants		Measurement Methods		Design and Statistical Analysis
Gender	female	Diagnostic	type of instrument	Sample size	N < 100
	male	Criterion variable* (Selection level T2)	PRO		100 ≤ N ≤ 200
Continent	Europe		NT or YA		N > 200
	Australia		SCHO	Prognostic period	< 1 year
Development stage	<U12		CR		1–3 years
	U12-U15		NEXT		> 3 years
	U16-U19			Dimension of domains	unidimensional
Performance level T1	youth academy				multidimensional
	talent development program			Procedures	univariate
	regional clubs				multivariate
					person-oriented

Note.

*Criterion variable at the time of subsequent measurement, assessing whether individuals turned professional (PRO), joined a youth national team or a youth academy (NT or YA), received a scholarship for an elite program (SCHO), performance was rated by their coaches (CR) or simply reached next age class at the competitive playing level (NEXT).