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Table 1 Stepwise spatial regression of the male OC incidence at the 296 townships.

From: Incidence of oral cancer in relation to nickel and arsenic concentrations in farm soils of patients' residential areas in Taiwan

   Coef 95% C.I. p-value mean SD
Full model const 14.37 (4.99,23.8)) 0.003   
  BQC 0.089 (0.03,0.15) 0.003 28.3 9.1
  CS -0.048 (-0.1,0.01) 0.091 62.4 8.2
  As 0.443 (0.26,0.63) <0.001 5.42 2.59
  Cd 0.404 (-0.15,0.97) 0.153 0.16 0.77
  Cr -0.182 (-0.49,0.12) 0.246 1.22 2.53
  Cu 0.078 (-0.04,0.19) 0.178 7.77 8.16
  Hg -1.892 (-5.76,1.98) 0.339 0.17 0.12
  Pb -0.058 (-0.18,0.06) 0.347 8.95 4.24
  Ni 0.499 (0.23,0.77) <0.001 2.76 2.93
  Zn -0.071 (-0.14,0) 0.054 12.8 12.8
  Income -0.003 (-0.01,0) 0.288 616 93.8
  Fd 0.004 (-0.01,0.02) 0.620 30.8 32.9
  Age -0.17 (-0.37,0.03) 0.096 34.8 2.48
  Aborigine 0.702 (-0.72,2.12) 0.334 0.12 0.34
R 2 = 53.52%      
Moran's I = -0.021 p-value = 0.677    
Concise model const 3.05 (1.36,4.75) 0.001   
  BQC 0.078 (0.03,0.12) 0.001   
  As 0.466 (0.28,0.65) <0.001   
  Ni 0.326 (0.17,0.48) <0.001   
  Aborigine 1.43 (0.14,2.72) 0.031   
R 2 = 50.98%      
Moran's I = -0.013 p-value = 0.81    
  1. Regression result on prevalence of betel quid chewing (BQC) and cigarette smoking (CS), 8 heavy metal concentrations (As~Zn), average income, age, factory density (Fd) of the area, and indicator for residency of aboriginal (1 if yes, and 0 otherwise). Government defined an area as a residency of aboriginal if more than 40% of its population is comprised of aboriginals. Ni is nickel concentration and As is arsenic concentration.