Table 2

Means and standard deviations for connectivity variables in Los Angeles (n = 8542) and San Diego (N = 1942) counties.

Los Angeles

San Diego

Variable

Mean

S.D.

Mean

S.D.

Link Node Ratio

1.828

0.263

1.627

0.268

Connected Node Ratio

0.863

0.123

0.751

0.133

Intersection Density

47.05

21.72

39.25

18.28

Street Density

11.96

2.853

10.16

3.179

Block Density

37.51

20.49

29.01

19.36

Average Block Length

0.168

0.053

0.181

0.110

Median Block Length

0.160

0.055

0.156

0.089

Alpha*

0.163

0.084

0.113

0.090

Gamma*

0.449

0.056

0.416

0.060

N = 8414 and 1852 for alpha and 8536 and 1911 for gamma in Los Angeles and San Diego counties respectively

Note values for all variables are significantly different between counties (p < 0.0001).

Berrigan et al. International Journal of Health Geographics 2010 9:20   doi:10.1186/1476-072X-9-20