TABLE 2—

Descriptive Statistics for Students and Schools: National Longitudinal Study of Adolescent Health, 1994–1996 (n = 59 987)

Characteristic	Sample, No. (%) or Mean ±SD
Students
Overweight	2999 (25)
Female	29 600 (51)
Age, y	15.00 ±1.71
Race
White	32 132 (55)
Hispanic	9542 (16)
Asian	3247 (6)
Black	8964 (15)
Other	4084 (7)
Grade	9.59 ±1.61
Grade point average	1.79 ±0.81
Depression score	0.38 ±0.55
No. of sport activities	1.20 ±1.41
No. of nonsport activities	0.97 ±1.42
No. of incoming friendships	4.47 ±3.71
Schools
No. of students	670 ±501
Percentage of overweight students	25 ±7
Type
Middle	33 (38)
Middle/high	17 (19)
High	38 (43)
Reciprocity score	0.39 ±0.06
Triad closure score	0.21 ±0.07