Table 4.

Characteristics of other trials

Trial	Number randomised	Disease/condition	Participants	Setting	Intervention(s)	Control	Outcome retention trial	Time point used in analysis
Motivation vs information
Cox 2008	120	Exercise improvement	Sedentary Women	Australia Community	Motivational workshops and newsletters	Information sheets and newsletters	Program and trial retention at 6 and 12 months	6-month and 12-month data. Data for 6 months used
Chaffin 2009	153	Parenting improvement	Adults referred for parenting improvement	US community	Self-motivation information	Standard information	Program attendance/trial retention	Retention at 12 weeks
Case management vs usual follow-up
Ford 2006	703	Screening prostate, lung, ovarian, colorectal cancer	Adults in the PLCO screening trial	US sites	In-depth case management	Regular trial procedures	Attendance at face to face cancer screening	Retention at 3 years
Open vs blind trial design
Avenell 2004	538	Prevention of fracture	Adults with a history of osteoporotic fracture	UK hospital	Open trial design	Blind trial design	Postal questionnaire response at 4, 8, 12 months	Response at12 months