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Fig. 1 | Respiratory Research

Fig. 1

From: Prevalence and risk factors for asthma among children aged 0–14 years in Hangzhou: a cross-sectional survey

Fig. 1

The sampling and investigation procedure: In the sampling stage, we firstly randomly selected one district, then randomly selected two communities, 14 kindergartens, five primary schools, and four junior middle schools. International Study of Asthma and Allergies in Childhood (ISAAC) and National Epidemiology study of Asthma and Allergies in China (NEAAC) questionnaires were used in stage 1 and stage 2 investigations, respectively

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Respiratory Research

ISSN: 1465-993X

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