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Table 2 Participation and explicit refusals in a survey of patient-care related regret, for numbered versus non-numbered return envelopes

From: Effect of numbering of return envelopes on participation, explicit refusals, and bias: experiment and meta-analysis

  Numbered envelopes Non-numbered envelopes P value
Returned a completed questionnaire 30.3% (314/1038) 35.0% (156/446) 0.073
Never returned the questionnaire 46.6% (484/1038) 47.5% (212/446) 0.78
Explicit refusals among eligible persons 23.1% (240/1038) 17.5% (78/446) 0.016
Explicit refusals among returned envelopes 43.3% (240/554) 33.3% (78/234) 0.011
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