Skip to main content

Table 1 Results of random allocation of voucher or not on response rate

From: The effect of a monetary incentive on return of a postal health and development questionnaire: a randomised trial [ISRCTN53994660]

  Voucher No voucher
Questionnaire returned 156 (42.3%) 108 (30.6%)
Questionnaire not returned 213 245
Total 369 353