Figure 1: Intervention frequency in percent of cases by trauma group.
Schema mode interventions were most frequent. Significant differences
between the trauma groups were observed for the use of skills training.
Bonferroni-adjusted Fisher tests between the trauma groups: * p< .05.
Trauma and the Development of Symptom
Severity
We then tested for higher symptom severity and less decrease in symptom
severity in the trauma group (Hypothesis 2a, 2b). Adding trauma group as
a factor significantly improved the models for anxiety and depression
symptoms (BAI: F (1, 345.86) = 4.23, p = .041, BDI-II:F (1, 1,264.71) = 5.33, p = .021), indicating differences
in symptom severity between the trauma groups across time. As expected,
group means for the trauma group were higher than for the no-trauma
group on BAI and BDI-II at the start and end of therapy, see Figure 2.
Adding time as a factor improved the models for anxiety and depression
symptoms (BAI: F (1, 190.53) = 118.27, p < .001,
BDI-II: F (1, 401.71) = 356.67, p < .001),
indicating a general decrease in symptom severity over time across both
trauma groups. However, contrary to our expectation, adding the
interaction effect between the trauma group and time point did not
improve the models (BAI: F (1, 141.76) = 0.62, p = .431,
BDI-II: F (1, 346.90) = 0.01, p = .938), indicating no
evidence for differential symptom trajectories in the trauma group
compared to the no trauma group.