Spatial distribution characteristics analysis of dental fluorosis in children based on township scale
Objective To understand the spatial distribution pattern and aggregation characteristics of dental fluorosis based on township scale,and to provide scientific basis for regional prevention and control of drinking-water fluorosis.Methods The monitoring data of dental fluorosis of children aged 8～12 in Tianjin in 2020 were collected to establish the spatial geographic information database of dental fluorosis at the township scale.MapInfo,GeoDa and SaTScan were used to describe the spatial distribution characteristics,autocorrelation analysis and spatial scanning analysis of dental fluorosis in children.Results In 2020,the prevalence rates of dental fluorosis in children aged 8-12 in Tianjin was 36.23％,and the fluorosis community index was 0.70,showing a slight prevalence.The results of global autocorrelation analysis showed that there was positive spatial autocorrelation of dental fluorosis in children(Moran's I=0.4807,Z=12.1711,P＜0.001),and the spatial distribution of dental fluorosis in children of different genders and ages also existed positive correlation.Local Moran'I analysis showed that H-H clusters were distributed in 10 townships located in Wuqing district,Beichen district and other areas;L-L clusters were distributed in 4 townships located in Xiqing district,Jinnan district and other areas.Stratified analysis showed that the number of townships of H-H clusters tended to decrease and the number of townships of L-L clusters tended to increase with the decrease of the age.A high-value and a low-value cluster area were detected by SaTScan,and the cluster areas were basically consistent with the local Moran'I analysis results.Conclusion The distribution of dental fluorosis in children in Tianjin has a significant spatial clustering phenomenon,and high-high clusters are the key areas that need to be focused on in the prevention and control of drinking-water fluorosis.
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