This study indicated a combination of methods increased the return rate (80%) in a national survey of health educators (n = 546). Also, use of a $1.00 bill incentive was not significantly more effective than no incentive, and the rate of double responses in this anonymous mail survey was very low (1%).
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http://dx.doi.org/10.2466/pr0.1997.81.2.551 | DOI Listing |
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