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Table 3 Evaluation of nonresponse bias: Comparison of characteristics between early responders (initial mail-out) and late responders (2nd and 3rd reminder)

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

  ‘Early’ n = 48 ‘Late’ n = 29 P
Female 25% 40% 0.24a
Group practice (>1 GP) 94% 79% 0.10a
Reported fair or poor health 23% 25% 0.89a
  Mean (sd) Mean (sd)  
Age (years) 55 (6.5) 56 (8.1) 0.80b
Years in general practice 25 (9.4) 26 (9.8) 0.64b
Job satisfaction scale (‘0’ not satisfied to ‘10’ extremely satisfied) 7.4 (2.0) 7.6 (2.3) 0.77b
Burnout scale (‘0’ not burnt out to ‘10’ extremely burnt out) 3.3 (2.5) 2.8 3.0) 0.46b
  1. a χ 2 test, b t-test.