once daily orally

The PANSS is comprised of 30 items and three subscales. The Positive subscale contains seven questions to assess delusions, conceptual disorganization, hallucinations behavior, excitement, grandiosity, suspiciousness/persecution, and hostility. An anchored Likert scale from 1-7, where values of 2 and above indicate the presence of progressively more severe symptoms, is used to score each item. The PANSS Positive subscale score is the sum of all 7 items and ranges from 7 through 49. A higher score is associated with greater illness severity.

The PANSS is comprised of 30 items and three subscales. The Negative subscale contains seven questions to assess blunted effect, emotional withdrawal, poor rapport, passive/apathetic social withdrawal, lack of motivation, and similar symptoms. An anchored Likert scale from 1-7, where values of 2 and above indicate the presence of progressively more severe symptoms, is used to score each item. The PANSS Negative subscale score is the sum of all 7 items and ranges from 7 through 49. A higher score is associated with greater illness severity.

The PANSS is comprised of 30 items and three subscales. The General Psychopathology subscale addresses other 16 symptoms such as anxiety, somatic concern, and disorientation. An anchored Likert scale from 1-7, where values of 2 and above indicate the presence of progressively more severe symptoms, is used to score each item. The PANSS General Psychopathology subscale score is the sum of all 16 items and ranges from 16 through 112. A higher score is associated with greater illness severity.

Proportion of participants with treatment-emergent adverse events. An adverse event was defined as any untoward medical occurrence in a patient treated with a medicinal (investigational) product and which did not necessarily have a causal relationship with this treatment. Treatment-emergent adverse events (TEAEs) were defined as adverse events with a start date on or after the date of the first dose through the end of follow-up, or adverse events occurring before the date of first dose and worsening during the treatment or follow-up period.

Proportion of participants with treatment-emergent adverse events. A serious adverse event was defined as an AE that met one or more of the following criteria: Resulted in death; Was life-threatening (i.e., a patient was at immediate risk of death at the time of the event, not an event where occurrence in a more severe form might have caused death); Required hospitalization or prolongation of existing hospitalization; Resulted in persistent or significant disability or incapacity; Was a congenital anomaly or birth defect; Was an important medical event that might jeopardize the patient or might require medical intervention to prevent one of the outcomes listed above.

Placebo was administered orally once daily.

Total of all reporting groups

CGI-S is a clinician-rated assessment of the participant's current disease state on a 7-point scale, where a higher score is associated with greater severity of the disease.

The change from baseline in CGI-S score (repeated measures) at each visit during the treatment phase is presented for the mITT population

mITT (modified intent-to-treat) population

The PANSS is comprised of 30 items and three subscales. The Positive subscale contains seven questions to assess delusions, conceptual disorganization, hallucinations behavior, excitement, grandiosity, suspiciousness/persecution, and hostility. An anchored Likert scale from 1-7, where values of 2 and above indicate the presence of progressively more severe symptoms, is used to score each item. The PANSS Positive subscale score is the sum of all 7 items and ranges from 7 through 49. A higher score is associated with greater illness severity.

mITT (modified intent-to-treat) population

The PANSS is comprised of 30 items and three subscales. The Negative subscale contains seven questions to assess blunted effect, emotional withdrawal, poor rapport, passive/apathetic social withdrawal, lack of motivation, and similar symptoms. An anchored Likert scale from 1-7, where values of 2 and above indicate the presence of progressively more severe symptoms, is used to score each item. The PANSS Negative subscale score is the sum of all 7 items and ranges from 7 through 49. A higher score is associated with greater illness severity.

mITT (modified intent-to-treat) population

The PANSS is comprised of 30 items and three subscales. The General Psychopathology subscale addresses other 16 symptoms such as anxiety, somatic concern, and disorientation. An anchored Likert scale from 1-7, where values of 2 and above indicate the presence of progressively more severe symptoms, is used to score each item. The PANSS General Psychopathology subscale score is the sum of all 16 items and ranges from 16 through 112. A higher score is associated with greater illness severity.

mITT (modified intent-to-treat) population

Proportion of participants with treatment-emergent adverse events. An adverse event was defined as any untoward medical occurrence in a patient treated with a medicinal (investigational) product and which did not necessarily have a causal relationship with this treatment. Treatment-emergent adverse events (TEAEs) were defined as adverse events with a start date on or after the date of the first dose through the end of follow-up, or adverse events occurring before the date of first dose and worsening during the treatment or follow-up period.

Safety population defined as subjects who receive at least one dose of the study drug in the treatment phase.

Safety population defined as subjects who receive at least one dose of the study drug in the treatment phase.

Proportion of participants with treatment-emergent adverse events. A serious adverse event was defined as an AE that met one or more of the following criteria: Resulted in death; Was life-threatening (i.e., a patient was at immediate risk of death at the time of the event, not an event where occurrence in a more severe form might have caused death); Required hospitalization or prolongation of existing hospitalization; Resulted in persistent or significant disability or incapacity; Was a congenital anomaly or birth defect; Was an important medical event that might jeopardize the patient or might require medical intervention to prevent one of the outcomes listed above.

Safety population defined as subjects who receive at least one dose of the study drug in the treatment phase.

SM-13496 80 mg was administered orally once daily.

Placebo was administered orally once daily.