title: [A case-control study on the relationship of crocidolite pollution in drinking water with the risk of gastrointestinal cancer in Dayao County].
abstract: OBJECTIVE
  To explore the relationship of crocidolite pollution in drinking water with the risk of gastrointestinal cancer's death in Dayao County.
  
  
  METHODS
  A 1:2 matched case-control study involving 54 death cases of gastrointestinal cancer from a population-based cohort of twenty-seven years and 108 controls matched by age, gender, death time, etc was conducted to analyze the effect of local water condition on the risk of gastrointestinal cancer in Dayao County.
  
  
  RESULTS
  Results from logistic regression analysis suggested the longer of asbestos furnace use over time, the higher the mortality risk of gastrointestinal cancer (6 - 10 years: OR = 2.920, 95% CI 1.501 - 5.604. 11 - 15 years: OR = 3.966, 95% CI 2.156 -7.950. Over 15 years: OR = 4.122, 95% CI 1.211 - 7. 584). Drinking unboiled water leaded to an increased risk of gastrointestinal cancer (OR = 1.43, 95% CI 1.07 - 1.88). Type of drinking water was associated with gastrointestinal cancer. When compared with drinking tap water, OR for drinking well water was 1.770 (95% CI 1.001 - 2.444), 2.442 for drinking river water (95% CI 0.956 - 3.950), 2.554 for drinking house and field ditch water (95% CI 1.961 - 6.584), and 3.121 for drinking pond water (95% CI 1.872 - 6.566).
  
  
  CONCLUSIONS
  Related factors of drinking water in crocidolite-contaminated area in Dayao County were significantly associated with the mortality of gastrointestinal cancer.
authors.forename: Jing
authors.initials: J
authors.lastname: Mi
authors.forename: Wenjia
authors.initials: W
authors.lastname: Peng
authors.forename: Xianjie
authors.initials: X
authors.lastname: Jia
authors.forename: Binggan
authors.initials: B
authors.lastname: Wei
authors.forename: Linsheng
authors.initials: L
authors.lastname: Yang
authors.forename: Liming
authors.initials: L
authors.lastname: Hu
authors.forename: Rong'an
authors.initials: R
authors.lastname: Lu
mesh_terms: D017638:Asbestos, Crocidolite / Q000009:adverse effects* / Q000032:analysis; D016022:Case-Control Studies; D060766:Drinking Water; D004787:Environmental Pollution; D005770:Gastrointestinal Neoplasms / Q000139:chemically induced* / Q000453:epidemiology; D006801:Humans; D014874:Water Pollutants, Chemical / Q000009:adverse effects* / Q000032:analysis; D060753:Water Quality; D014881:Water Supply
chemical_list: D060766:Drinking Water; D014874:Water Pollutants, Chemical; D017638:Asbestos, Crocidolite