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目的：研究县乡级计划免疫接种率调查的抽样方法。方法：在充分利用计划免疫以往信息的基础上，采用整群抽样与二阶段整群抽样方法来实现。结果：建立的方法经计算机模拟与现场验证令人满意。结论：在９５％可信限与±１０％误差条件下，通常对乡级抽取２～３个行政村，对县级抽取６～８个行政村调查，即可反映计划免疫接种率状态。
OBJECTIVE: To study sampling methods for surveys of planned immunization coverage at county and township levels. Methods: On the basis of taking full advantage of the past information of the planned immunization, the method of cluster sampling and two-stage cluster sampling were used. Results: The established method was satisfactory by computer simulation and field verification. Conclusion: Under the conditions of 95% confidence limits and ± 10% error, usually 2 or 3 administrative villages are selected for township level and 6 to 8 administrative villages are selected for county level surveys to reflect the status of planned immunization rates.