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(a) Prevalence of betel quid chewing (%), (b) prevalence of cigarette smoking (%); (c) lower bound of 95% confidence interval of prevalence of betel quid chewing (%), and (d) prevalence of cigarette smoking (%); (e) upper bound of 95% confidence interval of prevalence of betel quid chewing (%), and (f) prevalence of cigarette smoking (%)
