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13 DaiH.LeventhalA

Compared with participants from cities or villages, participants from camps were significantly less likely to be e-cigarette users (9.8% of e-cigarette users were from camps compared with 45.1% from cities and 45.1% from villages)

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2.5 Confounders Potential confounders included sex, age, duration of residence, housing type, household size, availability of running water, use of paracetamol in the past 12 months, transport mode to school, school absenteeism, proximity to healthcare facilities, truck traffic near the home, and presence of pets (cats/dogs) in or around the household