2.2. Study design
A cross-sectional study was conducted from March to June 2018, among
stakeholders located inside and outside the OD area. The sampling frame
was based on databases of hunters and pig farmers provided by the
regional authorities. In the case of hunters, a list containing 200
names of the leaders of the local hunting teams has been provided by
Regional Association of hunters from Ardèche. A total of 30 hunters were
randomly drawn from a list of 200 names: 20 hunters from the OD area and
10 hunters from outside this area. As the participation to interviews
was volunteer, if some people drawn refused the interview, the next
names on the list were selected.
At the time of the study, the local Animal Health authority could not
provide us with an anonymous list of the total of number of outdoor pig
farmers in the region (n=81). The selection of farmers was then targeted
towards those individuals practicing at least partial outdoor farming in
a part of their facilities and therefore, potentially exposed to wild
boar incursions (Fig. 1C). Based on this list of persons, one or c) two
farmers were sampled by municipality. Selection of the farmers was based
on information we could get from other farmers on potential candidates
for our survey and their contact details on systematic snowball process
the number of 30 farmers. Each candidate was preliminarily contacted by
phone to request his/her availability to participate in the survey. The
30 pig farms interviewed were distributed within the OD area (n = 21)
and outside (n = 9) on a “first available, first interviewed” basis
(Fig. 1C).