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Table 4 Household response proportions stratified by type of incentive

From: The use of incentives in vulnerable populations for a telephone survey: a randomized controlled trial

  Food Coupon #1 Food Coupon #2 Between Group Difference (95% Confidence Interval)
Response Rate 36.6% (n=142) 35.6% (n=135) 1.1% (−10.2%, 12.4%)
Cooperation Rate 45.6% (n=114) 43.6% (n=110) 2.0% (−11.0%, 15.0%)
Less Conservative Cooperation Rate 58.8% (n=114) 58.2% (n=110) 0.6% (−12.3%, 13.5%)
  1. n refers to the denominator. The response rate n is larger due to the inclusion of non-contacts.