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, 30Â km | All 754 ALS cases had at least 1 lake within 30Â km; 709 ALS cases had at least one lake within 10Â km. |
  Chlorophyll-a | ||
  Secchi depth | ||
  Total nitrogen | ||
Geographic variables | 10, 30Â km | All 754 ALS cases had at least 1 lake within 30Â km; 709 ALS cases had at least one lake within 10Â km. |
  Minimum distance to lake | ||
  Number of lakes within given radius |