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Table 4 Evaluation of Nonresponse bias: Comparison of survey sample with other data sources

From: A small unconditional non-financial incentive suggests an increase in survey response rates amongst older general practitioners (GPs): a randomised controlled trial study

  This study General rural GP population*
  n % (95%CI)** n %
Gender     
Male 47 70% (59% to 81%) 3238 71%
Female 20 30% (19% to 41%) 1354 29%
Age:
45-54 32 47% (35% to 59%) 2290 50%
55-64 28 41% (29% to 53%) 1660 36%
65+ 8 12% (4% to 20%) 642 14%
  1. * Source: Australian Institute of Health and Welfare, National Health Workforce Data Set 2011[9]. ** 95% confidence intervals.