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Table 1 Demographics of subject counties (based on respondents only), California (from CHIS 2001) and the entire USA (from the 2001 National Health Interview Survey [34]).

From: Associations between street connectivity and active transportation

Variable Los Angeles* San Diego* Combined* California* USA
Area (sq.km) 12,308 11,721 24,039 410,000 9,631,000
Population 9,662,000 2,813,000 12,475,000 34,400,000 285,000,000
Sample size 8,547 1,891 10,438 56,270 69,244
Gender (%)      
   M 50.7 (0.4) 50.3 (0.7) 50.6 (0.3) 48.9 (0.0) 47.9 (0.1)
   F 49.3 (0.4) 49.7 (0.7) 49.4 (0.7) 51.1 (0.0) 52.1 (0.1)
Race/ethnicity (%)      
   Non-Hispanic White 39.4 (0.4) 61.2 (0.8) 44.6 (0.3) 50.2 (0.0) 73.6 (0.4)
   Non-Hispanic Black 9.9 (0.2) 5.1 (0.5) 8.8 (0.2) 5.9 (0.0) 11.2 (0.3)
   Hispanic 38.2 (0.4) 22.8 (0.8) 34.5 (0.4) 29.3 (0.0) 10.6 (0.2)
   Other 12.5 (0.3) 10.8 (0.6) 12.1 (0.2) 14.5 (0.0) 4.6 (0.2)
Age      
18-39 47.6 (0.4) 47.3 (0.8) 47.5 (0.4) 45.7 (0.0) 39.6 (0.3)
40-59 33.7 (0.4) 32.8 (0.7) 33.5 (0.4) 34.9 (0.1) 38.1 (0.3)
60+ 18.8 (0.3) 19.8 (0.8) 19.0 (0.3) 19.4 (0.1) 22.3 (0.2)
Income (% of poverty level)      
   < 100 17.2 (0.5) 10.6 (1.0) 15.6 (0.4) 15.7 (0.2) 10.0 (0.2
   100-200 21.7 (0.6) 21.0 (1.2) 21.5 (0.6) 20.4 (0.3) 16.8 (0.3
   200-300 14.0 (0.5) 14.2 (1.0) 14.0 (0.5) 14.2 (0.2) 17.2 (0.3
   300+ 47.2 (0.7) 54.2 (1.5) 48.8 (0.7) 49.7 (0.2) 56.0 (0.4
Education (%)      
<HS 20.9 (0.7) 14.6 (1.1) 20.9 (0.5) 21.4 (0.1) 16.7 (0.2)
HS graduate 23.2 (0.5) 25.0 (1.2) 23.2 (0.5) 23.3 (0.1) 30.5 (0.3)
> HS 55.9 (0.7) 60.4 (1.3) 55.9 (0.6) 55.3 (0.2) 52.8 (0.4)