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. 2007 Nov 30;13(2):120–126. doi: 10.2188/jea.13.120

Table 4. Comparison of mean of the sum of physical activity time according to the level of intensity.

	Group	n	Before	After	Change	Net change ^a

			minutes	minutes	minutes	minutes

Light	Exercise	31	1302.7 (10.0)	1256.0 (18.6)	-46.7 (20.0)*	-47.2 (-94.1, -0.4)*
Light	Control	31	1277.8 (8.9)	1278.3 (11.5)	0.5 (12.2)	-47.2 (-94.1, -0.4)*

Moderate	Exercise	31	127.0 (9.6)	167.0 (18.7)	40.0 (20.1)	39.4 (-7.6, 86.3)
Moderate	Control	31	151.7 (8.2)	152.3 (10.5)	0.6 (12.2)	39.4 (-7.6, 86.3)

Strenuous	Exercise	31	10.3 (2.7)	17.0 (5.4)	6.7 (6.0)	7.9 (-5.2, 21.0)
Strenuous	Control	31	10.6 (2.5)	9.4 (3.0)	-1.2 (2.6)	7.9 (-5.2, 21.0)

a : The difference between the change in the exercise group and the change in the control group.

* : p<0.05