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Table 1 Distribution of questionnaire data and biological samples in cases and controls from EAGLE

From: Environment And Genetics in Lung cancer Etiology (EAGLE) study: An integrative population-based case-control study of lung cancer

  Cases No. 2101 Controls No. 2120
  No. % No. %
With data on major risk factors 2067 98.4 2116 99.8
With data on diet and behavioural factors 1903 90.6 2073 97.8
With at least one DNA sample* 2045 97.3 2117 99.9
   With blood sample 1891 90.0 1841 86.8
   With buccal rinse sample 154 7.3 282 13.3
With at least one pathology sample 1212 57.7   
   With tissue slides 1192 56.7   
   With paraffin-embedded tissue blocks 656 31.2   
   With fresh tissue samples 436 20.8   
  1. *Two cases and six controls donated both blood and buccal samples