Table 1

Number of eligible cases and controls and distribution of participants and non-participants, Brain Tumour case-control study 2000–2002, Sweden

Meningioma casesGlioma casesControls
 Participants (% participation)274 (85)366 (74)673 (70)
  Personal interview259346592
  Telephone interview121840
  Written questionnaire3241
  Failure of contact411101
  No permission to contact*731
  Too sick or deceased155914
  • * The attending physician did not give permission to contact the case.

  • No suitable relative to contact as proxy respondent. No proxy interviews were performed among controls.