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Table 3 Potential Cost of Different Incentive Strategies

From: Take the money and run? Redemption of a gift card incentive in a clinician survey

Method: Description Estimate of # participants receiving an incentive payment Total cost
(1) Up-front incentive Gift cards sent out with study invitation without reclaiming unused funds or use of cash with study invitation 177 $8850
(2) Up-front incentive with return of un-redeemed cards Gift cards sent out with study invitation and funds reclaimed if not redeemed within 4 months 74 $3700
(3) Conditional incentive Gift cards sent out only after completed survey is returned by participant 115 $5750
  Potential Savings for Method 2 vs. Method 1   $5150
  Potential Savings for Method 2 vs. Method 3   $2150