Prevention of Relapse With Injectable Paliperidone Palmitate Versus Oral Antipsychotics

The proportion of patients achieving a treatment response, defined as a ≥30% decrease (i.e., improvement) in Positive and Negative Syndrome Scale (PANSS) total score from baseline to endpoint. The PANSS is a 30-item scale (Range 30-210) 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. Higher scores indicate increased severity of schizophrenia symptoms.

Change from baseline in the PANSS: The PANSS is a 30-item scale (Range 30-210) 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. Higher scores indicate worsening.

Change from baseline in positive symptom, negative symptom and general psychopathology subscales of the PANSS scale. The PANSS scale is designed to assess symptoms of schizophrenia by means of the 30-items. The PANSS scale provides subscores for 3 subscales, that is, the positive symptoms subscale (7 items, range 7-49), the negative symptoms subscale (7 items, range 7-49), and the general psychopathology subscale (16 items, range 16-112). Each item of the scale is to be scored on a scale of 1 (absent) to 7 (extreme). Higher scores indicate higher severity of schizophrenia symptoms.

Change from baseline in schizophrenia symptoms were assessed through the following PANSS factor scores as described by Marder: (1) positive symptoms (range 8-56): sum of delusions, hallucinatory behavior, grandiosity, suspiciousness, stereotyped thinking, somatic concern, unusual thought content, lack of judgment and insight; (2) negative symptoms (range 7-49): sum of blunted affect, emotional withdrawal, poor rapport, passive social withdrawal, lack of spontaneity, motor retardation, and active social avoidance; (3) disorganized thoughts (range 7-49): sum of conceptual disorganization, difficulty in abstract thinking, mannerisms and posturing, disorientation, poor attention, disturbance of volition, and preoccupation; (4) uncontrolled hostility/excitement (range 4-28): sum of excitement, hostility, uncooperativeness and poor impulse control; (5) anxiety/depression (range 4-28): sum of anxiety, guilt feelings, tension, and depression. Higher scores indicate higher severity of symptoms

The Clinical Global Impression Severity (CGI-S) rating scale is a 7 point global clinical 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 higher impression of illness severity.

The Clinical Global Impression-Change (CGI-C) rating scale is used to rate the change in severity of the patient's illness compared to baseline (day 1 of core phase) on a 7-point scale ranging from 1 (very much improved) to 7 (very much worse).

The Personal and Social Performance (PSP) scale assesses degree of a participant's dysfunction within 4 domains of behavior: socially useful activities, personal and social relationships, self-care, and disturbing and aggressive behavior. Score ranges from 1 to 100, divided into 10 equal intervals 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. 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 Short Form-36 Health Survey (SF-36) is a measure of Participant-reported health status. It is a 36-item questionnaire measuring 8 domains (physical functioning, role physical, bodily pain, general health, vitality, social functioning, role emotional, and mental health). Two summary scale scores are computed based on weighted combinations of the 8 subscale scores: the Physical Component Summary and the Mental Component Summary. Each summary scale score ranges from 0 (worst) to 100 (best), with higher scores reflecting better health-related functional status.

The EQ-5D VAS records the respondent's self-rated health on a vertical, visual analog scale, with 0 representing the worst imaginable health state and 100 representing the best imaginable health state. The EQ VAS is used as a quantitative measure of health outcome as judged by the individual respondent.

The EuroQol-5 is a five dimensional health state classification. Each dimension is assessed on a 3-point ordinal scale (1=no problems, 2=some problems, 3=extreme problems). The responses to the five EQ-5D dimensions were scored using a utility-weighted algorithm to derive an EQ-5D health status index score between 0 to 1, with 1.00 indicating "full health" and 0 representing dead. A higher score indicates an improvement in health in the Health Status Index.

The SWN-S is a patient self-rated scale developed to measure the subjective well-being for the previous 7 days of a patient under neuroleptic treatment. The SWN-S consists of 20 items (each item is rated from 1=not at all to 6=very much). The total score ranges from 20 to 120 with higher score indicating greater subjective well-being.

Patient's satisfaction with medication was assessed using the Treatment Satisfaction Questionnaire for Medication (TSQM). The TSQM is divided into 4 subscales (effectiveness, side effects, convenience, and global satisfaction), with the value of each subscale ranging from 0 to 100. Higher scores indicate greater treatment satisfaction.

Physician's treatment satisfaction was assessed using the physician's treatment satisfaction scale which is designed to rate 4 aspects of treatment (efficacy, safety, mode of administration, and overall satisfaction), each on a scale ranging from 1 (extremely satisfied) to 7 (extremely dissatisfied).