Table 3.

Perceived recruitment barriers given in the literature as reported by each trial

Description	Minnesota (n = 534)	Vanderbilt (n = 610)	Stanford (n = 241)	CWRU (n = 360)
Time demands and scheduling conflicts	X	X	X	X
Disconnected phone number	X	X	X	X
Transportation to research site		X	X	X
Data collection requirement	X	X	X
Challenge working with a large group of institutions or organizations	X			X
Limited e-mail access	X			X
Transient population	X			X
Participants unfamiliar with research and study participation	X			X
Mails sent from school not received by family	X			X
Lack of interest	X			X
Feeling of mistrust	X
No staff from study population	X
Families failure to initiate interest in study			X
Limited number of bilingual staff				X
Needing both parent and child participation				X
Community collaborators unfamiliar with study
Extra paperwork for the participants
Low level of literacy or numeracy
Familial concerns that not all familial members will benefit
Failure to describe the study accurately
Inability to track the progress of potential participants