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Sample size calculation The formula for a cross-sectional study was used to calculate the sample size for each selected village: where p is the prevalence of hypertension in the Chinese population 13 , is the margin of error (to estimate prevalence with a precision is equal to half of the prevalence of hypertension), and deff is the effect of design ( deff =2)

The key message of our study, especially to the youth, is that there seems to be a significant interest for long-term immunity to never start smoking. The researchers looked over time at blood samples from a group of 1,000 healthy people ages 20 to 69

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When you rub strands between your fingers, they should separate easily and feel just barely tackynot damp, not crispy