Prevalence of endemic fluorosis in heavily prevalent area of Tianjin

Objective To investigate epidemiologic characteristics of endemic fluorosis in heavily prevalant area of Tianjin.Methods Three endemic fluorosis prvalence areas were selected with cluster sampling.The content of water fluoride,dental fluorosis among children aged 8-12 years,the situation of ske letal fluorosis among people above 16 years old,and the concentration of urine fluoride were detected.Results The geometric mean of urine fluoride was 2.64 mg/L.The urine fluoride of the girls was higher than that of the boys.The urine fluoride was positively correlated with water fluoride.The averag erate of dental fluorosis was 81.1%.The rate of dental fluorosis increased with age and positively corre lated with water fluoride.The prevalence rate of clinic skeletal fluorosis was 29.2% and the Xray positive rate was 39.4%.Conclusion The endemic fluorosis is still very serious in heavily prevalent areas of Tianjin.The prev alence rate of children dental fluorosis and adult skeletal fluorosis are positively correlated with water fluoride.The prev alence rate of adult skeletal fluorosis increases with age.