Validity and reliability of a physical activity questionnaire for Vietnamese adolescents

Table 2 Correlation coefficients and differences of time spent in MPA, VPA and MVPA measured by accelerometer and the V-APARQ

	Accelerometer vs V-APARQ1			Accelerometer vs V-APARQ2			Differences between accelerometers and V-APARQs
	All	Boys	Girls	All	Boys	Girls	All	Boys	Girls
	(n = 146)	(n = 69)	(n = 77)	(n = 146)	(n = 69)	(n = 77)	Mean	Mean	Mean
							(95 % CI)	(95 % CI)	(95 % CI)
MPA	0.19*	0.24*	0.10*	0.18*	0.25*	0.12*	30.2	60.7	3.2
MPA	0.19*	0.24*	0.10*	0.18*	0.25*	0.12*	(22.7, 37.6)	(50.1, 71.4)	(0.0, 8.6)
VPA	0.50*	0.52*	0.48*	0.48*	0.52*	0.43*	4.3	0.2	7.6
VPA	0.50*	0.52*	0.48*	0.48*	0.52*	0.43*	(2.0, 6.6)	(0.0, 4.3)	(5.3, 9.8)
MVPA	0.25*	0.30*	0.18*	0.22*	0.33*	0.15*	35.9	61.3	10.1
							(23.3, 48.4)	(40.9, 87.6)	(5.8, 20.4)

* Spearman correlation coefficients significantly different from zero (p < 0.05).
** Differences between of accelerometers and the average of V-APARQs.

ISSN: 1479-5868