Comparison of two cluster sampling methods for health surveys in developing countries
Comparison of two cluster sampling methods for health surveys in developing countries
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DOI：
10.1093/ije/dyh096
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发表时间：
2004-06-01
影响因子：
7.7
通讯作者：
Bennett, S
中科院分区：
文献类型：
--
作者：
Milligan, P;Njie, A;Bennett, S
背景扩大免疫规划(EPI)随机游走法已被世界卫生组织和其他组织广泛用于在没有最新的家庭抽样框架的情况下进行快速整群抽样调查。然而，这不是一个概率样本，不允许自上次人口普查以来的人口流动，也不能确保家庭选择的客观性，也不允许对没有答复的情况进行回电。方法我们进行了两次调查，一次使用计划免疫计划，另一次使用紧凑分段抽样，以估计2000-2001年间冈比亚西部地区的疫苗接种率。结果两次调查的接种率估计值相差很少超过2%。任何差异更有可能是由于家庭选择，而不是人口流动。一个简单的数学模型表明，即使在极端情况下，忽视自上次人口普查以来的人口流动也不太可能产生任何明显的影响。结论在保证野外工作质量的情况下，EPI随机游走法可以给出准确和精确的结果。然而，通常倾向于采用紧凑分段抽样，因为它确保了家庭选择的客观性，并能够估计人口总数(如未接种疫苗的人口)，这有助于规划服务提供。
Background The Expanded Program for Immunization (EPI) random walk method has been widely used by the World Health Organization and others for rapid cluster sample surveys where an up-to-date household sampling frame is not available. However, it is not a probability sample, does not allow for population movement since the last census, and does not ensure objectivity in household selection or permit call-backs for non-response. Compact segment sampling avoids these problems and has been proposed as a slower but cleaner alternative.Methods We conducted two surveys, one using the EPI scheme and one using compact segment sampling, to estimate vaccination coverage in Western Region of The Gambia within 3 months of each other in 2000-2001.Results Point estimates for vaccination coverage from the two surveys rarely differed by more than 2%. Any differences were more likely to be due to household selection than to population movement. A simple mathematical model showed that even in extreme situations, ignoring population movement since the last census is unlikely to have any appreciable effect. Rates of homogeneity did not differ systematically between the surveys.Conclusions In situations where quality of fieldwork can be guaranteed, the EPI random walk method can give accurate and precise results. However, compact segment sampling is generally to be preferred as it ensures objectivity in household selection and permits the estimation of population totals (such as those unvaccinated), which are helpful for planning service provision.