Table 2. Symptoms Comprising the ‘Big 3’ Psychosis Symptom Factors.

Scale	Symptom Factor
	Positive Symptoms/Reality Distortion	Negative Symptoms/Poverty	Disorganization
BPRS	1. Grandiosity 2. Suspiciousness 3. Hallucinations 4. Unusual thought content	1. Emotional Withdrawal 2. Motor retardation 3. Blunted affect	1. Conceptual Disorganization 2. Mannerisms and posturing 3. Disorientation
SAPS	1. Global ratings of hallucinations 2. Global ratings of delusions	None	1. Global ratings of attention 2. Global ratings of positive formalthought disorder 3. Global ratings of bizarre behavior
SANS	None	1. Global ratings of anhedonia/asociality 2. Global ratings of avolition/apathy 3. Global ratings of alogia 4. Global ratings of affective flattening
PANSS	1. Delusions 2. Hallucinations3. Unusual thought content	1. Lack of spontaneity 2. Blunted affect 3. Emotional withdrawal	1. Stereotyped thinking 2. Poor attention 3. Disorientation
	4. Suspiciousness 5. Grandiosity	4. Apathetic social withdrawal 5. Motor retardation 6. Poor rapport 7. Active social avoidance	4. Conceptual disorganization 5. Difficulty in abstraction
SOPS	1. Unusual thought content 2. Suspiciousness 3. Perceptual disturbances/ hallucinations 4. Grandiosity	1. Social anhedonia/withdrawal 2. Avolition 3. Decreased expression of emotion 4. Decreased experience of emotions and self 5. Deterioration in role functioning 6. Decreased comprehension/abstraction	1. Disorganized communication 2. Odd behavior and appearance 3. Bizarre thinking 4. Trouble with focus and attention 5. Personal hygiene

Note. BPRS = Brief Psychiatric Rating Scale; PANSS = Positive and Negative Syndrome Scale; SANS = Scale for the Assessment of Negative Symptoms; SAPS = Scale for the Assessment of Positive Symptoms; SOPS = Scale of Prodromal Symptoms