Fig. 2
From: Barriers and facilitators to the recruitment of disabled people to clinical trials: a scoping review
Types of evidence found in the review and the number of articles that drew on each of them. Types included were primary quantitative research (N = 17), primary qualitative research—patient perspective (N = 9), primary qualitative research—carer perspective (N = 4), primary qualitative research—researcher perspective (N = 1), short communication—researcher perspective (N = 22), and secondary research (N = 7)