In the WHO recommended EPI Cluster sampling for assessing primary immunization coverage, the age group of children to be surveyed is:-: (A) 0-12 months, (B) 6-12 months, (C) 9-12 months, (D) 12-23 months
Answer is D. Cluster random sampling: Used for immunization coverage evaluation Error rate for immunization coverage evaluation - +- 5% WHO recommended technique - 30 x 7 Total sample size - 210 Intercluster disparity - even the cluster are not comparable to each other; To remove intercluster disparity, we use DESIGN effect 30 clusters selected by systematic random sampling