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CountryYear (Round)ReportLength of time between VAS campaign and surveyHow regions chosenHow clusters (villages or other small administrative units) chosenHow households chosenHow caretakers and children within households chosenData quality control processes?Verification questions asked?
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Surveys from VAS mass campaigns supported by GiveWell-directed funds
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Mali2018 (1)HKI post-event coverage survey report, Mali round 1 20184 to 6 weeks"A separate sample was selected for each of the regions supported by HKI, Kayes and Ségou. In addition, to obtain an estimate of the national coverage, a third sample was selected containing all the regions accessible by the teams of investigators: the southern and southwestern regions, including Ségou and Kayes." Pg 9. Systematic random sampling with probability proportional to sizeSystematic random samplingRandom selection among children present in the household whose guardian is also present. Data collector training and field test, real-time data monitoring, use of teams of three surveyors, double data entry, data reviewThe caretaker is shown the Vitamin A pill and asked to identify and name it before being asked if the child received it.
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Burkina Faso2018 (1)HKI post-event coverage survey report, Burkina Faso round 1 20181 day to 5 weeksThe entire country was surveyed. There were two strata: urban and rural.Random sampling with probability proportional to size. Systematic random samplingRandom selection among children present in the household whose guardian is also present. Data collector training and field test, real-time data monitoring, use of teams of three surveyors, double data entry, data reviewThe caretaker is shown a capsule or picture of Vitamin A, and is asked whether the child received this.
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Guinea2018 (1)HKI post-event coverage survey report, Guinea round 1 2018Not available"three (3) strata were formed which are the Conakry [the capital city] zone, the HKI zone composed of the administrative regions of Kankan and Faranah and the non-HKI zone which includes the administrative regions of Boké, Kindia, Labé, Mamou and Nzérékoré." Pg 2.UnclearSystematic random samplingRandom selection among children present in the household.Data collector training and field test, teams of four surveyors, unspecified other supervision.Not specified
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Côte d'Ivoire2018 (1)Coverage surveys did not take place
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Guinea2018 (2)Coverage surveys did not take place
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Mali2018 (2)HKI post-event coverage survey report, Mali round 2 20184 to 6 weeksKayes and Ségou were the special focus areas for HKI's technical assistanceSystematic random sampling with probability proportional to sizeSystematic random samplingRandom selection among children present in the household whose guardian is also present. A random subset of households was re-interviewed, unclear other forms of quality controlNo
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Burkina Faso2018 (2)Coverage surveys did not take place
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Côte d'Ivoire2018 (2)HKI post-event coverage survey report, Côte d'Ivoire round 2 20181 day to 2 weeks"Stratum 1: 18 districts covered by HKI where vitamin A supplementation activities and deworming took place;

Stratum 2: 36 districts covered by UNICEF and MAP International where vitamin A supplementation and deworming activities took place;

Stratum 3: 11 districts covered by UNICEF and MAP International where screening for malnutrition took place." Pg 10-11.		Random samplingRandom samplingNot specifiedA random 10% of households was re-interviewed, teams of two surveyors, unspecified other supervisionnot specified
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Surveys from other VAS mass campaigns
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HKI guidelinesN/AHKI post-event coverage survey manual 2014Within six weeksChoosing which regions and populations to survey depends on the goals of the survey, available budget for the survey, and other factors (see cell note).Probability proportional to size (PPS) cluster samplingRandomRandom selection of children (if more than one eligible child in household). Random selection of caretaker (if the chosen child has more than one caretaker).Enumerators should work in pairs; team leaders should observe enumerator pairs in a rotating cycle; team leaders should check survey forms (or databases if using mobile data collection) at the end of each day for errors; double data entry and comparison to check for data entry errorsEnumerators are instructed to show capsules to caretakers when asking whether or not their child received VAS
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Nigeria2014 (2)HKI post-event coverage survey report Nigeria - Ekiti and Katsina states 2014Within six weeksEkiti and Katsina states had not yet been surveyed by HKIProbability proportional to size (PPS) cluster samplingRandomRandom selection of children (if more than one eligible child in household). Random selection of caretaker (if the chosen child has more than one caretaker).Data review by survey team leaders, pre-testing mobile phone data collection tools prior to the start of the survey.Not specified
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Tanzania2015 (1)HKI post-event coverage survey report Tanzania 2015Around one monthDar es Salaam chosen due to low coverage rates in previous yearProbability proportional to size (PPS) cluster samplingRandomRandom selection of childrenNot specifiedNot specified
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