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Table 1 Characteristics of included respondents subject to each jurisdiction’s helmet law

From: Bicycle helmet laws and persistent racial and ethnic helmet use disparities among urban high school students: a repeated cross-sectional analysis

  Dallas San Diego Miami-Dade & Broward Counties
% (CI) % (CI) % (CI)
Characteristics
 Female sex, % (CI) 44.4 (43.2, 45.7) 41.9 (40.6, 43.2) 46.3 (45.1, 47.6)
 Race/Ethnicity, % (CI)    
  White, non-Latino 10.8 (9.8, 12.0) 33.7 (32.2, 35.2) 23.6 (22.0, 25.3)
  African American, non-Latino 40.6 (38.8, 42.4) 13.9 (12.9, 14.9) 28.7 (26.8, 30.7)
  Latino 48.6 (46.8, 50.4) 37.9 (36.4, 39.4) 47.7 (45.7, 49.7)
  Asian --- 14.5 (13.6, 15.4) ---
 Age, % (CI)
  14 and under 12.3 (10.8, 14.0) 18.9 (17.1, 20.7) 27.6 (26.3, 29.0)
  15 years old 31.7 (29.6, 34.0) 30.7 (28.9, 32.4) 72.4 (71.0, 73.7)
  16 years old 26.6 (24.5, 28.8) 28.1 (26.4, 29.9) ---
  17 years old 18.5 (16.7, 20.5) 22.4 (20.5, 24.4) ---
  18 and over 10.9 (9.4, 12.5) --- ---
 Sample Sizes, n 11,514 9871 10,865
  1991 1894 --- 961
  1993 1847 1047 809
  1995 1776 1072 849
  1997 875 1309 935
  1999 934 898 987
  2001 951 873 875
  2003 967 798 948
  2005 631 743 963
  2007 561 743 686
  2009 466 886 867
  2011 612 823 1088
  2013 --- 679 897
  1. Sample sizes (n) are unweighted. Percentages and their confidence intervals for respondent characteristics are weighted. “---” denotes that that subpopulation or survey year was excluded from the analysis for reasons described in the methods