Gender and grade differences in objectively measured physical activity and sedentary behavior patterns among Japanese children and adolescents: a cross-sectional study

Table 1 Demographic distribution and accelerometry of the study population

		Overall		Boy		Girl
		n	%	n	%	n	%
		691	100.0	329	47.6	362	52.4
Grade level
	Preschool	105	15.2	51	15.5	54	14.9
	Lower grades of elementary school	88	12.7	36	10.9	52	14.4
	Higher grades of elementary school	136	19.7	68	20.7	68	18.8
	Junior high school	362	52.0	174	52.9	188	51.9
Weight status
	Healthy weight
	Preschool	100	95.2	50	98.0	50	92.6
	Lower grades of elementary school	80	90.9	34	94.4	46	88.5
	Higher grades of elementary school	115	84.5	55	80.9	60	88.2
	Junior high school	329	90.9	158	90.8	171	91.0
	Overweight or obese
	Preschool	5	4.8	1	2.0	4	7.4
	Lower grades of elementary school	8	9.1	2	5.6	6	11.5
	Higher grades of elementary school	21	15.4	13	19.1	8	11.8
	Junior high school	33	9.1	16	9.2	17	9.0
Sedentary behavior, min/day
	Mean ± SD	441.4 ± 140.1		408.6 ± 122.2		471.3 ± 148.5
Light intensity physical activity, min/day
	Mean ± SD	307.1 ± 70.0		315.3 ± 67.4		299.7 ± 71.6
Moderate physical activity, min/day
	Mean ± SD	34.6 ± 14.8		35.8 ± 15.3		33.5 ± 14.2
Vigorous physical activity, min/day
	Mean ± SD	28.3 ± 19.1		31.4 ± 22.0		25.4 ± 15.4
Steps/day
	Mean ± SD	12462.6 ± 4452.5		14010.6 ± 4628.2		11048.7 ± 3771.4
Wearing time/day
	Mean ± SD	811.2 ± 118.7		790.9 ± 107.7		829.7 ± 125.3
Expressed as a percentage of the wear time, %
	Sedentary activity	53.7		51.2		56.0
	Light intensity physical activity	38.4		40.2		36.7
	Moderate physical activity	4.3		4.6		4.1
	Vigorous physical activity	3.6		4.0		3.1

ISSN: 1471-2458