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Background  Chronic sinusitis (CRS) is a common otorhinolaryngologic disease that is frequently encountered in everyday practice, but there is a lack of precise data regarding the prevalence of CRS in developing countries. We performed a national investigation in China to determine the prevalence and associated factors of CRS.    Methods  We conducted a cross‐sectional investigation in 2012. A stratified four‐stage sampling method was used to select participants randomly from seven cities in mainland China. All participants were interviewed face‐to‐face via a standardized questionnaire. Unconditional logistic regression analyses were conducted to examine the association between smoking and sinusitis after adjusting for socio‐demographic factors.    Results  This study included a total of 10 636 respondents from seven cities. The overall prevalence of CRS was 8.0% and ranged from 4.8% to 9.7% in seven centres. Chronic sinusitis affected approximately 107 million people in mainland China. Chronic sinusitis was particularly prevalent among people with specific medical conditions, including allergic rhinitis, asthma, chronic obstructive pulmonary disease and gout. The prevalence was slightly higher among males (8.79%) than females (7.28%) ( P  = 0.004), and the prevalence varied by age group, ethnicity and marital status and education ( P  <   0.05), but not by household per capita income or living space ( P  > 0.05). Both second‐hand tobacco smoke and active smoking were independent risk factors for CRS ( P  = 0.001).    Conclusions  Chronic sinusitis is an important public health problem in China. Our study provides important information for the assessment of the economic burden of CRS and the development and promotion of public health policies associated with CRS particularly in developing countries.

Epidemiology of chronic rhinosinusitis: results from a cross‐sectional survey in seven C hinese cities