Table 3

The effects of town level variables before and after adjustment for individual level variables

Town level variableAnalysis A3-150Analysis B3-150
Town variance, after fitting each variable on its own (plus age)% of town variance explained, after age adjustmentOdds ratio for effect of town level variable, per SD increase
(95% CI)
Town variance, after fitting each variable plus all subject level variables% of town variance explained, after adjustment for all subject level variablesOdds ratio for effect of town level variable (95% CI)
Water hardness0.0200300.91 (0.83 to 1.00)0.012890.96 (0.88 to 1.05)
Average maximum temperature0.0116590.88 (0.81 to 0.95)0.0098300.93 (0.86 to 1.02)
Average minimum temperature0.0243140.94 (0.85 to 1.03)0.0114190.95 (0.87 to 1.03)
Average daily sunshine0.0157450.89 (0.82 to 0.98)0.0112210.95 (0.87 to 1.03)
Annual rainfall0.0192321.10 (1.01 to 1.21)0.0125111.04 (0.96 to 1.14)
  • 3-150 In analysis A, each variable is adjusted for age alone. In analysis B, each variable is adjusted for all eight subject level variables: age, smoking, physical activity, BMI, alcohol intake, systolic blood pressure, cholesterol, social class, and height. The percentage of town variance explained is the percentage reduction in the variance for a model that includes the particular town level variable from that given for a model not including that town level variable.