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Table 3 Distribution of individually matched case-control sets according to the number of matched controls and the exposure of the case and the matched controls to agricultural land

From: Pesticide exposure assessed through agricultural crop proximity and risk of amyotrophic lateral sclerosis

Matching ratio   Exposed controls
  0 1 2 3 4
1:2 Case exposed 1 1 0 - -
  Case unexposed 1 1 0 - -
1:3 Case exposed 3 15 12 0 -
  Case unexposed 8 16 11 2 -
1:4 Case exposed 21 82 89 59 7
  Case unexposed 42 126 128 60 18