Cluster analysis of 2007 survey data of current status of the national brick-tea-born fluorosis / 中国地方病学杂志

ObjectiveCluster analysis method was applied to analyze the data of brick-tea-born fluorosis,to clarify the provincial and municipal classification hierarchy in nation-wide epidemic areas and to guide the prophylaxis and treatment of the disease.MethodsPrevalence survey database of the 2007 national brick-tea-born fluorosis was analyzed.Detection rate of second degree and above clinical skeletal fluorosis as clustered index,clustering analysis of all survey data was carried out,clustering figure was drawn,and analysis of variance and multiple comparison was done.ResultsThe provincial level of the nation-wide epidemic areas of the brick-teaborn fluorosis could be classified into three categories:the first category including Tibet and Sichuan province,the second category including Qinghai province,and the third including Inner Mongolia,Gansu,Xinjiang and Ningxia provinces; The city-level they were also could be classified into three categories:the first category including Aba,Shigatse region and Lhasa,the second including Wulanchabu,Hulun Buir,Baotou,Qinghai state,Guoluo state,Haixi state,Xining city,Haidong state,Ganzi state,Longnan city,Jiuquan city,Urumqi city and the state of Bortala,and the other cities were the third category cities.The differences of clinical skeletal fluorosis detection rate between the first,second,and third provincial and municipal categories(35.18％,16.21％,5.22％,41.16％,19.64％,4.19％) were statistically significant (all P ＜ 0.05).ConclusionsBrick-tea-born fluorosis can be classified by using cluster analysis at the provincial and municipal levels.Cluster analysis results can provide a scientific basis for effective implementation of the prophylaxis and treatment of brick-tea-born fluorosis.

Analysis on the present running status of water-improving project in Anda city,Heilongjiang province in 2008 / 中国地方病学杂志

Objective To understand the running status and distribution of water-improving pmjects in Anda city.Methods The running and management of the water-improving projects were investigated and located the position by Global Positioning Systerm(GPS)in Anda city.Results Among 317 water-improving projects,16.09%were either long-term projects or in poor management or had already stopped usage,77 projeets were broken,accounting for 24.29%;all inadequate supply of equipment and pipeline,83 projects had never been started,accounting for 26.18%;now,106 projects were running,accounting for 33.44%.In only 46 projects,the water fluoride concentration was lower than 1.00 mg/L,accounting for 14.51%,as a result 36 thousand people benefited.Conclusions The running status of water-improving projects was unacceptable,most of them stopped running and endemic fluorosis control was still severe in Anda city.