Please select the eligibility criteria that correspond to the clinical trial below.
Title: Evaluation of the Necessity of Long-term Pharmacological Treatment With Antipsychotics for the Prevention of Relapse in Long-term Stabilized Schizophrenic Patients: a Randomized, Single-blind, Longitudinal Trial
Brief Summary: The main objective of the trial is to evaluate, how long an antipsychotic relapse-prevention should be continued and to which time a patient with schizophrenia is protected enough, so that a withdrawal or reduction of the medication seems appropriate. Relapse is defined as primary outcome.


Options:
A: Inclusion Criteria:

* Diagnosis of schizophrenia or schizoaffective disorder
* The participants have to be in remission for at least 3 years (i.e. no psychiatric hospitalisation) under a stable antipsychotic medication. Remission will be measured using the remission criteria by Andreasen et al. (2005) Score ≤3 for the items concerning psychosis of the "Positive and Negative Syndrom Scale" (PANSS; Kay et al., 1987): "Delusions" (P1), "Conceptual disorganisation" (P2), "Halluzinations" (P3), "Mannerisms and posturing" (G5) and "Unusual thought content" (G9) and a score ≤3 on the "Clinical Global Impression Severity Scale" (CGI-S; Guy, 1976)
* Able to give informed consent

Exclusion Criteria:

* Actively suicidal
* Serious medical illnesses
* Known non-complience concerning the medication
* Medication with clozapin
* Medication with antidepressants and mood stabilisors that were initiated during the last 6 weeks before study enrollment
* Patients with substance dependence other than nicotine or caffeine within 6 months prior to baseline
* Unability to give informed consent
* Pregnancy
B: Inclusion Criteria:

* Patients must have schizophrenia
* Patients must be clinically stable on antipsychotic medication
* Patients must be retrospectively judged by investigators, based on clinical interview and impression, to have been stable (with respect to their symptoms of schizophrenia) for at least 4 weeks entry into the study
* Patients must be an outpatient and have BPRS positive items scores of 4 or less to enter the study
* Female patients of childbearing potential must be using a medically accepted means of contraception.

Exclusion Criteria:

* Patients must not have participated in a clinical trial of another investigational drug, including olanzapine, within 1 month (30 days) prior to study entry.
* Female patients must not be pregnant or breast-feeding
* Patients must not be experiencing acute, serious, or unstable medical conditions other than schizophrenia
* Patients must not require concomitant treatment with any other medication with primarily central nervous system activity, including antidepressants, mood stabilizers, and anticonvulsants.
* Patients must not have a substance (except nicotine or caffeine) dependence within the past 30 days
C: Inclusion Criteria:

Main inclusion criteria

* The subject has a primary diagnosis of schizophrenia
* The subject experiences clinically significant symptoms
* The subject's medication remained stable for 8 weeks prior to screening
* The subject is currently in the post-acute maintenance phase of his/her disease

Exclusion Criteria:

Main exclusion criteria

* The subject is at significant risk of suicide
* The subject is treatment resistant
* The subject has experienced an acute exacerbation within 8 weeks prior screening
* The subject is unlikely to comply with the protocol
* The subject has a current diagnosis or a history of substance abuse
D: Inclusion Criteria:

* DSM-IV diagnosis of schizophrenia or schizo-affective disorder
* Capacity to provide written, informed consent
* Stabilized\* on a single oral antipsychotic for at least three months (excluding CLOZAPINE or QUETIAPINE)
* Evidence of compliance with previous antipsychotic treatment, i.e. greater than 90% \* defined as 2 consecutively identical CGI evaluations (screening and baseline, at least one week apart)

Exclusion Criteria:

* exposure to depot antipsychotic during 12 months prior to enrollment
* substance-related disorders according to DSM-IV

Answer: A