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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