Table 3.

Multiple regression analysis predicting psychological and social outcomes from training duration.

Dependent variable	Predictor	β	SE	t-value	p-value	95% CI
Self-Efficacy (SESC)	Training Duration (Months)	0.39	0.06	6.18	<0.001***	[0.27, 0.51]
	Socioeconomic Status	0.22	0.05	4.33	< 0.001**	[0.11, 0.34]
	Peer Acceptance	0.28	0.07	5.02	<0.001***	[0.17, 0.40]
Perceived Stress (PSQ-20)	Training Duration (Months)	−0.36	0.07	−5.69	<0.001***	[−0.48, −0.24]
	Competition Stress	0.34	0.06	5.28	<0.001***	[0.22, 0.46]
	Socioeconomic Status	−0.19	0.05	−3.82	< 0.001**	[−0.30, −0.08]
Social Competence (SSBS-2)	Training Duration (Months)	0.41	0.06	6.42	<0.001***	[0.29, 0.53]
	Cooperation	0.33	0.07	5.71	<0.001***	[0.21, 0.45]
	Peer Acceptance	0.30	0.06	5.27	<0.001***	[0.19, 0.42]
Antisocial Behavior (SSBS-2)	Training Duration (Months)	−0.38	0.07	−5.92	<0.001***	[−0.51, −0.25]
	Aggression	−0.33	0.06	−5.38	<0.001***	[−0.45, −0.21]
	Withdrawal	−0.31	0.07	−5.02	<0.001***	[−0.44, −0.19]

Regression coefficients (β) are standardized. Higher training duration was associated with higher self-efficacy and social competence, while negatively associated with stress and antisocial behavior. **p < 0.01. ***p < 0.001.