According to the WHO expanded programme on immunisation methodology adopted in India, coverage of childhood immunisation is estimated by visiting children in 30 randomly selected clusters, examining 7 children per cluster from consecutive households until the quota is filled. This technique is known as:
- A 30-cluster sampling technique ✓
- B Lot quality assurance sampling
- C Stratified proportionate sampling
- D Consecutive systematic sampling
Correct answer: A. 30-cluster sampling technique
Explanation
The 30-cluster sampling technique recommended by WHO for immunisation coverage assessment selects 30 clusters by probability proportional to population size, then samples 7 children per cluster, giving 210 children total. It was developed because simple random sampling across wide rural areas is impractical. Lot quality assurance sampling classifies areas as acceptable or unacceptable based on small samples rather than estimating coverage, and stratified proportionate sampling requires sampling from every predefined stratum.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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