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Sample size calculation Sample size calculation assumed e-cigarette prevalence of 70.0% in exposed versus 55.0% in unexposed groups, with 80.0% power and =0.05, yielding a required minimum of 894 participants plus a 15.0% non-response buffer 13 , resulting in a final sample of 1020 participants
However, soot caused by synthetic materials like plastic will be oily and cant be removed with dry methods alone
When the jasmine stem is about two centimeters (say three quarters of an inch) in diameter a cloth is wrapped around it to prevent access of dust and of the sun's rays
It's possible that nicotine could affect brain development, or that access to oxygen during pregnancy might be reduced when the mothers smoke, the researchers said
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