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Table 2 Participants for the quantitative research component were then recruited using a multi-stage cluster sampling technique across 42 locations. Sampling included four stages

From: Protocol for a national, mixed-methods knowledge, attitudes and practices survey on non-communicable diseases

Primary Sampling Unit Based on proportional population to size (PPS) sampling, each of the 21 clusters was selected from 137 Khoroos (suburbs) in urban and 324 Soums (regions) in rural areas respectively;
Secondary Sampling Unit For each Khoroo and Soum, 2 family centres (groups of ± 1000 households) and Baghs (sub-regions) were selected respectively using PPS;
Tertiary Sampling Unit Based on the list of households from the selected secondary sampling units, 82-84 households were selected using simple random sampling to make a final sample;
Participants One person aged 15-64 years in the selected household was selected at random. These were selected at random using a predefined, paper-based algorithm.