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)
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Secretan B, Straif K, Baan R, Grosse Y, El Ghissassi F, Bouvard V, Benbrahim-Tallah L, Guha N, Freeman C, Galichet L, Cogliano V ( 2009 ) A review of human carcinogens - part E: tobacco, areca nut, alcohol, coal smoke, and salted fish
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