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Table 3
Frequency and time in bouts of physical activity by 3 different accelerometer’s epoch lengths
		Epoch length
		4 sec	20 sec	60 sec
Frequency (bouts/day)	TPA3	3.3 ± 1.8	5.1 ± 2.0^**	9.0 ± 3.3^**,‡
	TPA5	1.5 ± 1.1	2.7 ± 1.4^**	5.6 ± 2.1^{**, ‡}
	TPA10	0.4 ± 0.5	0.8 ± 0.8^**	2.2 ± 1.1^{**, ‡}
	MVPA3	1.1 ± 1.3	1.8 ± 1.3^**	1.2 ± 0.9^{**, ‡}
	MVPA5	0.5 ± 0.8	0.9 ± 0.8^**	0.7 ± 0.7^**
	MVPA10	0.2 ± 0.3	0.3 ± 0.4^**	0.3 ± 0.4^**
Time (min/day)	TPA3	22.0 ± 15.1	41.3 ± 21.6^**	101.8 ± 37.6^{**, ‡}
	TPA5	14.8 ± 13.2	30.0 ± 20.3^**	80.2 ± 33.2^{**, ‡}
	TPA10	6.9 ± 9.9	15.9 ± 17.0^**	47.7 ± 27.8^{**, ‡}
	MVPA3	7.7 ± 10.0	14.3 ± 12.8^**	13.8 ± 13.8^**
	MVPA5	5.2 ± 8.1	10.3 ± 11.2^**	10.6 ± 12.8^**
	MVPA10	2.6 ± 5.4	5.4 ± 8.8^**	6.5 ± 10.5^**

Data are expressed as the means with the standard deviation (mean ± SD). TPA3, TPA5, and TPA10; Bouts of physical activity lasting longer than 3 min, 5 min and 10 min. MVPA3, MVPA5, and MVPA10; Bouts of moderate to vigorous intensity physical activity lasting longer than 3 min, 5 min and 10 min.

^**Significantly different compared with 4 sec (^**p < 0.01). ^{†, ‡}Significantly different compared with 20 sec (^†p < 0.05, ^‡p < 0.01).

Ayabe et al. BMC Research Notes 2013 6:20 doi:10.1186/1756-0500-6-20

Table 3