Table 1.

Demographic characteristics of the caffeine consumers and the controls.

	Caffeine Consumers (n = 16)	Controls (n = 16)
Age (years); [f, m]	14.5 ± 0.4 (11.9–16.8); [15.1 ± 0.6, 14.0 ± 0.4]	14.4 ± 0.4 (11.8–16.4); [15.0 ± 0.5, 13.8 ± 0.5]
Caffeine consumption (mg/kg/d)	2.5 ± 0.4 *	0.1 ± 0.0 *
Chronotype	4.3 ± 0.2	3.8 ± 0.2
Socio Economic Status, SES	5.0 ± 0.5(5)	3.8 ± 0.3(7)
Sex (f, m)	8 f, 8 m	8 f, 8 m
Tanner puberty scale; [f, m]	7.7 ± 0.7(3); [8.4 ± 1.3, 7.9 ± 0.9]	7.5 ± 0.6(2); [7.7 ± 1.1, 7.4 ± 0.7]
Weight (kg)	52.3 ± 2.6	51.2 ± 3.7(6)