Table 1

Characteristics of the exposed and unexposed postcodes

Exposed postcodes (n=661)Unexposed postcodes (n=2473)
Size of population (average number of inhabitants)203446838
Number of cases204167
Number of person years4034292650732955
Rural/urban status
    Rural103 (15.6%)1071 (43.3%)
    Urban244 (36.9%)690 (27.9%)
    Both314 (47.5%)712 (28.8%)