It was a survey done online with the International Association of Conference Interpreters, the AIIC. They are interpreters from all fields, people who work in the private sector or at Parliament. No study has been done relating precisely to parliamentary interpreters. As well, people were free to respond to the survey or not. I do not believe that all interpreters in Canada responded to the survey, but a number of AIIC members did respond.
There are a lot of reasons why interpreters are not going to consult. That is also part of the report. Among other things, interpreters are afraid they will not be taken seriously. Often, when ordinary clinical testing is done, no abnormality is found, so they get the feeling they are not being taken seriously.