Flow of participants through the trial. 'Refused' due to lack of interest in continuing, repeatedly missed appointments, scheduling conflicts. 'Not Assessed' due to temporary health problems or scheduling conflicts, but willing to keep participating in our research. 'Out of touch' due to home phone or address change, stay out. 'Died' includes cancer, stroke, cardiac sudden death. 'Withdraw' indicates subjects withdrew for reasons including the death of a family member, poor health, lack of interest, had no time, changed contact, stressed. 'Completed Training' means subjects complete 80% of the training sessions (≥ 19 training sessions).
Cheng et al. BMC Medicine 2012 10:30 doi:10.1186/1741-7015-10-30