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Table 1 Years of diagnosis and residential history characteristics of study participants. The analyses used data from two existing population-based case-control studies.

From: Spatial-temporal analysis of breast cancer in upper Cape Cod, Massachusetts

Characteristic Study 1 Study 2 Final Dataset
Diagnosis/Index Years 1983–86 1987–93 1983–93
No. of Cases 207 453 660
No. of Case Residences 327 684 1,011
Mean No. of Residences per Case 1.58 1.51 1.53
No. of Controls 526 445 971
No. of Control Residences 762 704 1,466
Mean No. of Residences per Control 1.45 1.58 1.51
Case/Control Ratio 0.39 1.02 0.68
Total No. of Participants 733 898 1,631
Total No. of Residences 1,089 1,388 2,477
Mean No. of Residences per Participants 1.49 1.55 1.52