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Table 1 Number of participants randomised and numbers responding based on first, second and third mail out (Number randomised = 125)

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

  Total N Total responders n (%) Responders by group, n (%) OR (95% CI)
Initial mail out
 Pen 63   27 (42.9%) 1.46 (0.71- 3.02)
 No pen 62   21 (33.9%) 1.00
Total 125 48 (38.4%)   
First reminder
 Pen 63   36 (57.1%) 1.85 (0.91 - 3.75)
 No pen 62   26 (41.9%) 1.00
Total 125 62 (49.6%)   
Final reminder
 Pen 63   39 (61.9%) 1.85 (0.91 - 3.77)
 No pen 62   29 (46.8%) 1.00
Total 125 68 (54.4%)