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Table 3 Study population by sex and age

From: A clinical trial alert tool to recruit large patient samples and assess selection bias in general practice research

  Net sample Not contacted Contacted
  % "open" % exclusions % refusals % enrolees %
Gender* (n = 16,067) (n = 10,906) (n = 3 248) (n = 387) (n = 1,526)
Women 72.0 70.5 73.2 69.0 81.3
Men 28.0 29.5 26.8 31.0 18.7
Women** (n = 11,574) (n = 7,690) (n = 2,377) (n = 267) (n = 1,240)
60 - 69 29.2 31.7 16.4 32.6 37.6
70 - 79 32.4 32.8 25.7 37.1 41.9
80+ 38.4 35.6 57.9 30.3 20.6
Men*** (n = 4,493) (n = 3,216) (n = 871) (n = 120) (n = 286)
70 - 79 56.4 41.5 44.2 56.7 70.6
80+ 43.6 58.5 55.8 43.3 29.4
  1. * Chi2 = 80.9; df = 3; p < .0001
  2. ** Chi2 = 607.8; df = 6; p < .0001
  3. *** Chi2 = 97.9; df = 3; p < .0001
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BMC Medical Research Methodology

ISSN: 1471-2288

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