Table 6.

Pearson interclass correlation coefficient (ICC) and the corresponding 95% confidence interval (95% CI) between energy expenditure either during school, vacation and whole year periods and both the indirect and direct peak VO₂ measurements, by gender and group ages.

	Indirect VO2		Direct VO2
	ICC	95% CI	ICC	95% CI
All (N =36)
School period (280 days) (kJ·kg-1·day-1)	.54 **	.26-.74	.67 **	.43-.82
Vacations period (85 days) (kJ·kg-1·day-1)	.52 **	.23-.72	.64 **	.40-.80
12- month period (kJ·kg-1·day-1)	.56 **	.28-.75	.69 **	.40-.80
Males (N =18)
School period (280 days) (kJ·kg-1·day-1)	.43 *	-.04 -.75	.59 **	.18-.83
Vacations period (85 days) (kJ·kg-1·day-1)	.46 *	-.01-.76	.63 **	.23-.85
12- month period (kJ·kg-1·day-1)	.45 *	-.01-.76	.63 **	.22-.84
Females (N =18)
School period (280 days) (kJ·kg-1·day-1)	.34	-.15-.69	.57 **	.14-.82
Vacations period (85 days) (kJ·kg-1·day-1)	.37	-.11-.71	.55 **	.11-.81
12- month period (kJ·kg-1·day-1)	.37	-.12-.71	.61 **	.18-.83
(8-10 years) (N =12)
School period (280 days) (kJ·kg-1·day-1)	.44 *	-.18-.81	.64 **	.10-.89
Vacations period (85 days) (kJ·kg-1·day-1)	.39 **	-.23-.79	.57 *	.00-.86
12- month period (kJ·kg-1·day-1)	.44*	-.18-.81	.64 **	.10-.89
(11-13 years) (N =12)
School period (280 days) (kJ·kg-1·day-1)	.71 **	.23-.91	.69 **	.20-.91
Vacations period (85 days) (kJ·kg-1·day-1)	.78 *	.36-.93	.78 **	.38-.94
12- month period (kJ·kg-1·day-1)	.78 **	.36-.93	.76 **	.34-.93
(14-16 years) (N =12)
School period (280 days) (kJ·kg-1·day-1)	.82 **	.46-.95	.89 **	.64-.97
Vacations period (85 days) (kJ·kg-1·day-1)	.73 **	.28-.95	.78 **	.38-.94
12- month period (kJ·kg-1·day-1)	.82 **	.47-.95	.89 **	.64-.97

* p < 0.05

** p < 0.01