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Fig. 2 | BMC Pulmonary Medicine

Fig. 2

From: Chronic obstructive pulmonary disease, bronchial asthma and allergic rhinitis in the adult population within the Commonwealth of Independent States: rationale and design of the CORE study

Fig. 2

Stratified random cluster sampling procedure. SEC (Study Executive Committee) randomly selected districts in each city. Each city district was divided into squares (on the city map). Similar random strategy was applied for map squares within districts and then for streets within map squares and then for households within streets

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BMC Pulmonary Medicine

ISSN: 1471-2466

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