id
: Person identification
set
: Matched set indicator
case
: Case-control status (1:case, 0:control
age
: Age of individual
sex
: Sex of individual (1:male, 2:female)
abroad
: Within the last two weeks visited abroad (1:yes, 0:no)
beef
: Within the last two weeks eaten beef
pork
: Within the last two weeks eaten pork
veal
: Within the last two weeks eaten veal
poultry
: Within the last two weeks eaten poultry
liverp
: Within the last two weeks eaten liverpaste
veg
: Within the last two weeks eaten vegetables
fruit
: Within the last two weeks eaten fruit
egg
: Within the last two weeks eaten eggs
plant7
: Within the last two weeks eaten meat from plant no. 7
}The participants were asked at which retailer(s) they had purchased meat. Retailers were independently of this linked to meat processing plants, and thus participants were linked to meat processing plants. This way persons could be linked to (amongst other) plant no 7.