Table 4

Between town and within town components of variance for the individual risk variables

Risk variable Between town variance Within town variance Intra-town correlation
Continuous variables
 Systolic blood pressure17.7403.40.042
 Serum total cholesterol0.02031.070.019
 Body mass index0.047310.320.005
Categorical variables
 Current smoking4-150 0.1091.0
 Heavy drinking0.2041.0
 Physical inactivity0.1081.0
 Manual social class0.4121.0
  • 4-150 Within town variance is set at 1 for categorical binary variables.