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Table 3 Independent variables, or hot spot risk factors, considered in the analysis are divided in two categories: water quality parameters or geographic variables

From: Mapping amyotrophic lateral sclerosis lake risk factors across northern New England

Variable Scale(s) Notes
Water quality parameters 10, 30 km All 754 ALS cases had at least 1 lake within 30 km; 709 ALS cases had at least one lake within 10 km.
  Chlorophyll-a
  Secchi depth
  Total nitrogen
Geographic variables 10, 30 km All 754 ALS cases had at least 1 lake within 30 km; 709 ALS cases had at least one lake within 10 km.
  Minimum distance to lake
  Number of lakes within given radius