This difference fell short of significance (p = 0.065), but the analysis of covariance for the primary and secondary outcomes were repeated using depersonalisation as an added covariate in order to control for any bias that this might have introduced into the main analysis.
Primary outcome: Attitudes At follow-up, after adjusting for baseline differences using analysis of covariance, the overall attitude score at follow-up between intervention and control groups was not significantly different at p = 0.05 although there was a trend toward significance (intervention mean 116.56 s.d. 21.02 vs. control mean 131.15 s.d. 16.15, p = 0.078).
The adjusted mean for sub-scale "self-esteem in working with drinkers" was still higher for the intervention group, but felt short of significance (mean difference -2.67 95% [CI -5.67 to 0.33] p = 0.079).
Improvements in attitudes towards working with drinkers and drug users in mental health settings failed to reach statistical significance.