Table 2

The variance of the log(odds of CHD) between towns after adjustments for individual level variables (n = 7543)

Model		Analysis A^2-150		Analysis B^2-150
Model		Town variance	% of town variance explained	Odds ratio for high incidence to low incidence town	Town variance	% of town variance explained	Odds ratio for high incidence to low incidence town
None	0.0284	0	1.94	0.0284	0	1.94
Smoking	0.0155	45	1.63	0.0155	45	1.63
Social class	0.0202	29	1.75	0.0128	55	1.56
SBP	0.0206	27	1.76	0.0087	69	1.44
Physical activity	0.0208	27	1.76	0.0076	73	1.41
Height	0.0222	22	1.79	0.0064	77	1.37
BMI	0.0266	6	1.89	0.0061	79	1.36
Alcohol	0.0267	6	1.90	0.0095	67	1.47
Cholesterol	0.0375	−32	2.14	0.0141	50	1.59

↵2-150 In analysis A, each variable is adjusted for age alone. Variables are listed in order of their ability to explain town variance. In analysis B, each variable is adjusted successively for all variables above it in the table. The percentage of town variance explained is the percentage reduction in the variance for a particular model to that given for a model only including age.