“…The PRS showed promising results in assessing those at a risk of an unfavourable outcome (Flyckt et al, 2006). It is well known that males and females differ regarding age at onset, clinical features and outcome of psychosis (Foerster et al, 1991;Hafner, 2003;Lindamer et al, 2003;Preston et al, 2002;Salokangas et al, 2003;Usall et al, 2003) but this has not been suffi ciently taken into account by the predictive scales available today (Phillips, 1953;Stephens et al, 1997;Strauss and Carpenter, 1974;Vaillant, 1964). Therefore, we have considered it important to examine whether the PRS had an equally promising predictive potential for both genders.…”