Table 1.

Student Demographic Characteristics, School Activity Participation, and Associated BMI Percentile Averages

Demographic Variables	n	%	Mean BMI Percentile	SD BMI Percentile
Gender
Female	19854	49.2	56.4	28.9
Male	20474	50.8	49.4	27.2
Age
9–11 years olda	3605	8.9	49.7	31.2
12–13 years old	10738	26.6	51.1	29.4
14–15 years old	13019	32.3	54.6	27.1
16–17 years old	11227	27.8	53.5	27.5
18–20 years olda	1605	4.0	52.6	28.8
Race/Ethnicityb
White	20310	50.4	51.3	27.8
Black	1377	3.4	63.8	27.9
Latino/Hispanic	2979	7.4	59.7	28.7
Asian	2231	5.5	48.7	29.0
Other	3401	8.4	52.0	30.4
Missing	10030	24.9	54.4	27.6
School sport participant
Yes	21880	54.3	52.7	27.3
No	18448	45.7	53.1	29.5
School club or student government participation
Yes	11647	28.9	52.3	27.7
No	28681	71.1	53.1	28.6

^aThere were only 3 students who were 9 years old and 68 students who were 19 or 20 years old after exclusion criteria were applied.

^bThe race/ethnicity question was not included in the survey administered at approximately one-third of the schools. In order to retain data from these schools in the analyses, the ‘Missing’ category was included representing primarily those who were not asked about their race/ethnicity. Excluding this category the percentage distribution of race/ethnicity is as follows: 67% Whites, 5% Blacks, 10% Latino/Hispanics, 7% Asians, and 11% Others.

Note: Percentages for categories may not add to 100% because of a small number of missing values.