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Table 1 Calls sample, calls needed per completed survey by country

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

Country Sample size Price per minute of call (USD) Average minutes of an incomplete call Average minutes of a complete call Paid calls needed per completed survey
Total sample of calls Subsample of young adults (<  45 years)
Bangladesh 20,467 8531 0.05 1 11 41
Colombia 5800 3410 0.05 2 10 46
Uganda 4947 3701 0.10 1 10 15
  1. Source: Total sample of calls is the number of calls estimated to obtain a sample of calls that is representative of the age-sex population distribution. Subsample of calls is the number of calls estimated to obtain a sample of calls that is representative of the population that is less than 45 years old. Calls needed per completed survey represent the number of paid calls required to obtain in average one complete survey