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Table 2 Outcomes

From: Does a monetary incentive improve the response to a postal questionnaire in a randomised controlled trial? The MINT incentive study

  Incentive
n = 1070 (%)
No incentive
n = 1074 (%)
Risk ratio
Questionnaire returned 810 (75.7) 738 (68.7) 1.10 (1.05, 1.16)
Questionnaire returned without chasing 560 (52.3) 493 (45.9) 1.14 (1.05, 1.24)
Non-responder (after all follow-up efforts including outcome data collection by telephone) 96 (9.0) 142 (13.2) 0.68 (0.53, 0.87)