Table 1. General characteristics of obese^ª study subjects.

	Girls (N = 9,720, 39%)		Boys (N = 15,422, 61%)
Variable	Number	%	Number	%	p value b
Age (years) c					< .001
10	1590	16.36	3335	21.62
13	3473	35.73	6042	39.18
16	4657	47.91	6045	39.20
Body mass index (kg/m2)					< .001
23≤ <25	2686	27.63	2887	18.72
≥25	7034	72.37	12535	81.28
Systolic blood pressure (mmHg)					< .001
<130	9072	93.33	13554	87.89
≥130	648	6.67	1868	12.11
Diastolic blood pressure (mmHg)					< .001
<80	8755	90.07	13468	87.33
≥80	965	9.93	1954	12.67
Total cholesterol (mg/dL)
≤170	5269	54.21	8801	57.07	< .001
170–199	3004	30.91	4500	29.18
≥200	1447	14.89	2121	13.75
Fasting blood glucose (mg/dL)
<100	8579	88.26	12635	81.93	< .001
100–125	1065	10.96	2613	16.94
≥126	76	0.78	174	1.13
Aspartate transaminase (U/L)					< .001
≤45	9482	97.55	14321	92.86
>45	238	2.45	1101	7.14
Alanine transaminase (U/L)					< .001
≤45	9205	94.70	12910	83.73
>45	515	5.30	2509	16.27

^a all of the study subjects were obese by degree of obesity index.

^b Chi-square test was used.

^c median age for each school year