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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
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BMC Health Services Research

ISSN: 1472-6963

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