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Table 1 Multi-stage stratified cluster sampling method

From: Population-based study on the prevalence of and risk factors for human papillomavirus infection in Qujing of Yunnan province, Southwest China

 

Stage 1

Stage 2

Stage 3

Stage 4

Sample size

Urban areas

Central city zone

Community units / Township

Community Residents’ Committee

Individuals

 

×1

×6

×6

×85

3060

Rural areas

Counties

Towns

Villages

Individuals

 

×3

×4

×3

×85

3060

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Virology Journal

ISSN: 1743-422X