 POSITIVE AND NEGATIVE SYMPTOM SCHEDULE PANSS The PANSS Kay et al. 1987 will be performed at screeningbaseline and at each evaluation visit. The PANSS consists of a Positive Scale 7 positive symptom constructs, a Negative Scale 7 negative symptom constructs and a General Psychopathology Scale 16 symptom constructs. For each patient, the scale should be administered by the same rater at the same time of day. 