Table 1 Response rates and reasons for non-response among brain cancer cases and controls in Canada
From: Brain tumours and cigarette smoking: analysis of the INTERPHONE Canada case–control study
Response | Glioma cases | Meningioma cases | Controls | |||
|---|---|---|---|---|---|---|
N | % | N | % | N | % | |
Eligible | 271 | 100.0 | 133 | 100.0 | 1325 | 100.0 |
Responded | 166 | 61.3 | 93 | 69.9 | 648 | 48.9 |
Non-response | ||||||
Subject refused | 20 | 7.4 | 17 | 12.8 | 428 | 32.3 |
Physician refused | 19 | 7.0 | 10 | 7.5 | - | - |
Subject deceased or ill, no proxy available | 48 | 17.7 | 3 | 2.3 | 6 | 0.5 |
Untraced or other | 18 | 6.6 | 10 | 7.5 | 243 | 18.3 |