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Table 3 Total costs comparing $2 and $5 conditions and one versus two mailings

From: A comparison of small monetary incentives to convert survey non-respondents: a randomized control trial

  $2 condition $5 condition
First Mailing-total cost per participant* $5.25 $8.25
First mailing response rate 47.67% 57.77%
Total cost/returned survey ($) $11.01 $14.28
Second Mailing-total cost per participant** $2.40 $2.40
Second mailing response rate 33.91% 22.50%
Total cost/returned survey ($) $7.08 $10.67
Final Response   
Cumulative response rate 65.41% 67.27%
Total cost/returned survey ($) $9.95 $13.77
  1. *total cost per survey included survey packet, incentive and reminder postcard
  2. **total cost per survey included survey packet only