Table 1.

Sample Characteristics*

CorrelateProportionNumber
Sex
 Male50.8%8727
 Female49.2%9039
Age
 Mean age15.5 + −.1211–21 y
Ethnicity/race
 Non-Hispanic white66.7%9348
 Non-Hispanic black16.7%3933
 Hispanic12.7%3148
 Asian 4.0%1337
Maternal education
 < High school 16.2%2993
 High school/general education
 development
32.4%5297
 Some college25.8%4512
 College degree13.3%2623
 Graduate/professional degree 7.6%1496
Family income
 Low ($0–$26 200)32.3%5798
 Middle ($26.2–$50 000)37.0%6642
 High ($50 000+)30.6%5326
Recreation center use
 Use center80.4%14 083 
 Don't use center19.6%3683
Weekly PE
 0 times/wk78.7%13 962 
 1–4 times/wk6.7%1276
 5 times/wk14.6%2528
Crime level (total crime/100 000)
 Low (0–4 796)37.4%6189
 Medium (4800–7139)33.2%6503
 High (7170–16 855)29.4%5074
  • * are weighted to be nationally representative.