Secondhand Tobacco Exposure Assessed Using Urinary Cotinine Among 10-Year-Old Children in Japan: An 11-Year Repeated Cross-sectional Study.

Conclusions While the prevalence of SHT exposure showed a decreasing trend from 2011 to 2021, the prevalence of SHT exposure was higher in children with household members using tobacco products, regardless of the type of tobacco product, than in those without tobacco users.

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In the additional analysis, there was an increasing trend in the prevalence of HTP users among tobacco users in the household, whereas the prevalence of CC users showed a declining trend ( Figure S3 ).

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