Adherence/maintenance intervention
The maintenance program used in the
DPP was more intensive than that used in
other clinical trials (6,7) and combined
both group and individual contact. After
completing the 16-session core curriculum,
the protocol required that participants
be seen face-to-face at least once
every 2 months for the remainder of the
trial and be contacted by phone at least
once between visits. Although these inperson
contacts were usually one-on-one,
they could occur in a group as long as
there was an opportunity to weigh the
participant and assist the individual with
problem-solving regarding adherence.