left-hand rule (fleming’s rule for motors)
age-specific prevalence of anti-HAV
Baseline infection prevalence
Bottom-up and prevalence based approach
caries prevalence
乳牙龋齿盛行率
乳齿龋齿盛行率
龋齿盛行率
龋齿发生率
患龋率
Characteristic of prevalence
Charateristics in prevalence
Chronic disease prevalence
chronic prevalence rate
Contraceptive prevalence
dental caries prevalence rate