Dear Alfonso

thank you for your quick and detailed reply! We did the additional analyses and found the following results for the scatter plots (see attached file). From this can we conclude now that: 
(high scorers = more symptoms, low scorers=less symptoms)

1.a. The low scorers (in both subscore groups) show anticorrelation under placebo
1.b. The high scorers (in both subscore groups) show less anticorrelation under placebo

2.a. The low scorers (in both subscore groups) show less anticorrelation under treatment
2.b. The high scorers in subscore1 show less anticorrelation under treament and the high scorers in subscore2 show more antiorrelation

3. This means the treatment seems disrupt the anticorrelation in low scorers, but seems to be beneficial for high scorers from subscore2 - but not for high scorers from subscore1. But with the interpretation of the REX results effect sizes from the last post, one could derive that the treatment only affects the subscore1. --> We are still unsure how to connect all the information?

Kind Regards 
Julian