The PANSS is a 30-item scale with each item rated on a scale of 1 (absent) to 7 (extreme psychopathology), designed to assess various symptoms of schizophrenia including delusions, grandiosity, blunted affect, poor attention, and poor impulse control. The PANSS total score consists of the sum of all 30 PANSS items and ranges from 30 to 210. Higher scores indicate worsening.

The intent-to-treat (ITT) population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

The PANSS is a 30-item scale designed to assess various symptoms of schizophrenia including delusions, grandiosity, blunted affect, poor attention, and poor impulse control. The 30 symptoms are rated on a 7-point scale that ranges from 1 (absent) to 7 (extreme psychopathology). The PANSS total score consists of the sum of all 30 PANSS items and ranges from 30 to 210. Higher scores indicate worsening.

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

The PANSS negative subscale based on marder factor assesses 7 negative-symptoms of schizophrenia. Negative symptoms represent a diminution or loss of normal functions. The symptoms are rated on a 7-point scale, with a range of 7 (absent) to 49 (extreme psychopathology).

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

The subscales based on marder factors are: positive symptoms, disorganised thoughts factor, uncontrolled hostility/excitement factor, and anxiety/depression factor. The symptoms are rated on a 7-point scale, with a range of 8 to 56 for positive symptoms, 7 to 49 for disorganized thoughts and 4 to 28 for Uncontrolled hostility/excitement and anxiety/depression. Higher score indicate worsening.

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

The PANSS provides a total score (sum of the scores of all 30 items) and scores for 3 subscales, the positive subscale (7 items), the negative subscale (7 items), and the general psychopathology subscale (16 items), each rated on a scale of 1 (absent) to 7 (extreme).

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

Clinical stability is defined as a decrease of 20 percent or more from Baseline in PANSS total score and CGI-S score less than or equal to 4 at Days 56 and 182, no hospitalizations due to psychiatric illness and no emergence of clinically significant suicidal or homicidal ideation during the maintenance phase.

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

The CGI-S rating scale is a 7-point global assessment that measures the Clinician's impression of the severity of illness exhibited by a participant. A rating of 1 is equivalent to "Normal, not at all ill" and a rating of 7 is equivalent to "Among the most extremely ill participants". Higher scores indicate worsening.

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

The PSP scale assesses degree of a participants' dysfunction within 4 domains of behavior: socially useful activities, personal and social relationships, self-care, and disturbing and aggressive behavior. The results of the assessment are converted to a numerical score to rate degree of difficulty (1=absent to 6=very severe) in each of the 4 domains. Based on 4 domains there will be 1 total score (total score ranges from 1 to 100, divided into 10 equal intervals). Participants with score of 71 to 100 have mild degree of difficulty; from 31 to 70, varying degrees of disability; less than or equal to 30, functioning so poorly as to require intensive supervision.

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.

The PANSS is a 30-item scale with each item rated on a scale of 1 (absent) to 7 (extreme psychopathology), designed to assess various symptoms of schizophrenia including delusions, grandiosity, blunted affect, poor attention, and poor impulse control. The PANSS total score consists of the sum of all 30 PANSS items and ranges from 30 to 210. Participants with PANSS response were defined as those who achieved greater than or equal to 20 percent or higher reduction from Baseline in the PANSS total score at Day 56 and 182.

The ITT population included all randomly assigned participants who received at least 1 dose of double-blind study drug, had both a Baseline measurement and at least 1 Post-Baseline measurement in the double-blind phase. Last observation carried forward (LOCF) method was used.