The following hypotheses were tested: that the cognitive behaviour therapy would be superior to supportive counselling and routine care, and routine care alone, firstly, in reducing positive psychotic symptoms; secondly, in preventing the exacerbation
of positive symptoms and reducing hospital stay; and, thirdly, by using the convention
of the previous study
of 50 % improvement in positive symptoms as an indicator
of considerable clinical improvement, 6 in the
number of patients achieving such improvement.