across treatment groups was not rejected (outpatient: scaled χ2 = 35.67, 24 df, p = .06; aftercare: scaled χ2 = 34.68, 24 df, p = .07), indicating that the transition matrices were statistically equivalent for the CBT, MET, and TSF groups. In the comparison across treatment arms, the alternative model provided a significantly better fit to the data (scaled χ2 = 74.77, 16 df, p < .0005), and the assumption of transition probability invariance was rejected.
