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. 2012 Sep 5;22(5):448–453. doi: 10.2188/jea.JE20110137

Table 1. Characteristics of study participants.

	Fourth graders			Seventh graders

	Boys	Girls	P-value^a	Boys	Girls	P-value^a
	n = 3162	n = 2996		n = 2368	n = 2368
	Age (years)	9.3 (0.5)		9.3 (0.5)	0.850		12.4 (0.5)	12.3 (0.5)	0.483
Height (cm)	135.0 (5.8)	135.1 (6.4)	0.568	154.9 (8.1)	153.1 (5.8)	<0.001
Weight (kg)	31.8 (6.9)	31.0 (6.4)	<0.001	45.3 (10.2)	44.3 (8.1)	<0.001
BMI (kg/m²)	17.3 (2.8)	16.9 (2.5)	<0.001	18.8 (3.1)	18.8 (2.8)	0.354
SBP (mm Hg)	110.9 (11.0)	110.0 (11.5)	0.004	110.4 (11.4)	108.3 (10.5)	<0.001
DBP (mm Hg)	60.5 (9.3)	60.4 (9.4)	0.537	57.5 (8.5)	58.3 (8.3)	0.001

BMI, body mass index; SBP, systolic blood pressure; DBP, diastolic blood pressure.

Values are mean (SD).

^aThe unpaired t-test was used to compare characteristics between boys and girls.