Analysis of monitoring results of coal-burning borne endemic fluorosis in Shanxi province in 2010

Objective: To investigate the current situation of coal-burning borne endemic fluorosis in the infected area, the usage of defluoridation stove and the formation of related behavior; to evaluate the control effect, so as to provide a theoretical basis for superiors' policy-making. Methods: Nine villages in three counties of Ankang city and Hanzhong city Shanxi province were monitored in 2010. Choose five disease infected villages with oven changed in the three monitoring counties, and 10 families were randomly selected in each of the nine monitoring points and every chosen village, and a survey on the stove using and related behavior changes was carried out. By using Dean method, the dental fluorosis of every child aged 8-12 in the monitoring villages was examined. Meanwhile 10 copies of urine samples were randomly collected in each age group in the above-mentioned villages. The content of fluoride in urine was determined by F-ion selective electrode(WS/T 30-1996) and evaluated according to "The Normal Concentration of Urinary Fluoride of Population" (WS/T 256-2005). Twenty men over 25 years old in the monitoring counties were randomly selected in each age group to be examined skeletal fluorosis by X-rays, and diagnosis was based on "The Endemic Skeletal Fluorosis Standard"(WS 192-2007). Results: The proper utilization rate and the qualified households of iron stoves and improved stoves, the correct drying rate and the correct storage rate of peppers and corns were all low. The washing rate of corns and peppers before eating was higher than 95%. Of the 350 children being examined of dental fluorosis in the 9 monitoring villages, the detection rate of dental fluorosis was 59.71%(209/350). A total of 871 adults over the age of 25 were examined, and the detection rate of skeletal fluorosis was 17.22% (150/871). A total of 350 copies of children urine samples were tested and the fluoride content were between 0.07-2.02 mg/L, the geometric mean value of fluoride content was 0.66 mg/L Conclusions: The coal-burning borne endemic fluorosis in Shanxi is in a growth phase, many defluoridation stoves are out of order, and the formation of healthy behaviors is low. To strengthen the disease surveillance, health education and management of defluoridation stoves are keys to prevent coal-burning borne endemic fluorosis in the future.