Table 1.

Descriptive statistics and correlation analysis between the study variables.

Variables	Boys n = 258	Girls n = 194	Total	p	Pearson’s Correlation
	M ± SD	M ± SD	M ± SD		1.	2.	3.	4.	5.	6.	7.	8.	9.	10
1. Body mass index (kg/m2)	21.87 ± 4.42	20.93 ± 3.32	21.48 ± 4.02	0.02	-	0.01	−0.07	−0.25 **	0.14 *	−0.07	−0.12 **	−0.10 *	−0.08	−0.06
2. Physical activity	1749.21 ± 0.80	1511.59 ± 0.75	1647.22 ± 0.79	0.01		-	0.33 **	0.20 **	0.26 **	0.13 **	0.38 **	0.36 **	0.10 *	0.20 **
3. Perceived competence (1–10)	6.77 ± 2.16	5.69 ± 2.29	6.31 ± 2.28	0.00			-	0.40 **	0.51 **	0.23 **	0.77 **	0.81 **	0.20 **	0.28 **
4. Physical appearance (1–10)	6.31 ± 1.69	6.01 ± 1.85	6.18 ± 1.76	0.07				-	0.34 **	0.48 **	0.48 **	0.72 **	0.34 **	0.31 **
5. Perceived strength (1–10)	6.29 ± 1.69	5.56 ± 1.56	5.98 ± 1.64	0.00					-	0.31 **	0.48 **	0.69 **	0.11 *	0.14 **
6. Self-esteem (1–10)	6.79 ± 2.08	6.53 ± 2.00	6.68 ± 2.04	0.18						-	0.27 **	85 **	0.09 *	0.14 **
7. Fitness	6.78 ± 1.99	6.11 ± 2.02	6.50 ± 2.03	0.00							-	0.83 **	0.21 **	0.37 **
8. Global self-concept score (1–10)	6.59 ± 1.42	5.98 ± 1.42	6.33 ± 1.45	0.00								-	0.26 **	0.34 **
9. Subjective happiness (1–7)	5.49 ± 1.06	5.29 ± 1.14	5.40 ± 0.1.10	0.04									-	0.47 **
10. Quality of life (1–5)	3.82 ± 0.59	3.70 ± 0.62	3.77 ± 0.61	0.03										-

Notes: * p < 0.05; ** p < 0.01.