Schizophrenia Cognition Scale Development

Cognitive impairment associated with schizophrenia (CIAS) has been shown to be the strongest
predictor of functional impairment among people with schizophrenia because it is associated
with poor response to psychosocial interventions, employment status, and social functioning.
Because the subjective experience of CIAS is likely to be associated with patient burden,
distress, and motivation for treatment, it is important that this experience be assessed in
a reliable and valid manner and from the perspective of the patient's self report. No
existing instrument to assess CIAS has been developed with patient input directly about
their qualitative experience of impaired cognition during the item generation stage, in
accordance with FDA guidance for patient-reported outcome (PRO) measures.

Inclusion Criteria:

1. Patients with established diagnoses of schizophrenia (confirmed by the Structured
Clinical Interview for DSM-IV [full version or Clinical Trial version] either
performed as part of the study screening process or as documented in the medical
record within 2 years prior to the study) with the following clinical features:

- a)Clinically stable and in the residual (non-acute) phase of their illness for
at least 8 weeks

- b)Maintained on current antipsychotic and concomitant psychotropic medications
for at least 6 weeks and on current dose for at least 2 weeks

- c)Have no more than a ''moderate'' severity rating on hallucinations and
delusions (e.g. Positive and Negative Syndrome Scale [PANSS] item scores < 5

- d)Have no more than a ''moderate'' severity rating on positive formal thought
disorder (e.g. Positive and Negative Syndrome Scale [PANSS] conceptual
disorganization item score < 5)

- e)Have no more than a ''moderate'' severity rating on negative symptoms (e.g.,
Positive and Negative Syndrome Scale-negative syndrome total score < 21)

- f) Have no more than a minimal level of depressive symptoms (e.g. Calgary
Depression Scale total score < 10); or, for eligibility for a waiting list, have
a moderate level of depressive symptoms (e.g., Calgary Depression Scale total
score between 10 and 15)

2. Male or female patients age 18 to 55 years

3. Exhibits reliability, physiologic capability, and an educational level sufficient to
comply with all protocol procedures.

4. Able to provide informed consent

Exclusion Criteria:

1. Patient currently treated with more than two antipsychotic medications

2. Patient's cognitive impairment severity compromises the ability of the participant to
participate meaningfully in a semi-structured interview, in the clinical judgment of
the investigator

3. Any suicidal ideation of type 4 or 5 in the C-SSRS in the past 3 months (i.e. active
suicidal thought with intent but without specific plan, or active suicidal thought
with plan and intent)

4. Non-psychiatric disorders of the central nervous system (including but not limited to
any kind of seizures, stroke, or traumatic brain injury)

5. Any other clinical condition that, in the opinion of the investigator, would
jeopardize a patient's safety while participating in this study

6. In the 6 months prior, having met the criteria for dependence or abuse according to
the DSM V in the opinion of the investigator.

7. Participation in another trial with an investigational drug or procedure within 30
days prior to screening or previous participation in any BI 409306 study

8. Unable to speak or read in English