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Table 4 Distribution of variable costs by type of incentive used and survey pricing mechanism, reported in USD

From: A cost study for mobile phone health surveys using interactive voice response for assessing risk factors of noncommunicable diseases

Country Incentive per completed survey Lottery incentive per completed survey
Survey pricing per min Survey pricing via flat fee Survey pricing per min Survey pricing via flat fee
Bangladesh 128,668 101,927 99,927 95,787
Colombia+ 37,244 NA NA NA
Uganda£ 32,073 41,259 32,613 41,259
  1. +Variable costs in Colombia do not change based on survey pricing mechanism as only price per minute was conducted
  2. £The lottery incentive amount used in Uganda was 20x the individual incentive per completed survey, resulting in the same cost per completed survey across fixed and lottery incentive arms of the trial