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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