In addition to the passing away of residents, there may
be other resident and staff factors leading to withdrawal
from the study. One reason for withdrawal might be that
the training program required active involvement from the
participants. Even if the residents had given their consent to
participate, and the program was individually adjusted for
each resident, it is reasonable to assume that the extra effort it
took to participate may explain why some residents dropped
out during the study period. However, this does not explain
the drop-out in the control group.