It seemed possible that prediction of outcome might be different
for couples who were in the clinically distressed range at the
commencement of therapy. The clinical distress cut off for the QMI
is < 30.5 (Funk & Rogge, 2007). In order to test this possibility we
reran the ROC analyses but just with the 65 couples whose mean
QMI was 30 or less before therapy. For the sake of brevity we do not
report these analyses, but can make them available on request to the
authors. In brief, the pattern of findings was very similar to that
obtained when running the analyses for the whole sample, with
accuracy of prediction at similar levels. Finally, it is possible that the
improvement in prediction from Session 3 to Session 4 is due to the
change in definition of being off-track being a decline of 2 or more
points after session 3 and no change after session 4. To test this
possibility, we examined predictionwhere off-track was defined as a
decrease of two or more points for both Sessions 3 and 4. The overall
prediction was almost identical to the original, showing it was the
extra data available after session 4 that enhanced prediction