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  ["project_title"]=>
  string(86) "Trajectories of Relapse and Predictors of Functioning in Antipsychotic Clinical Trials"
  ["project_narrative_summary"]=>
  string(628) "This project will analyze Janssen antipsychotic clinical trial data to examine trajectories of relapse following treatment discontinuation and to identify predictors of functioning. Using individual participant data, we will model heterogeneity in relapse timing  after withdrawal. We will also examine baseline demographic and clinical features  as predictors of functioning and relapse risk. The findings aim to clarify who benefits most from continued antipsychotic treatment and who may maintain stability after discontinuation, supporting more personalized maintenance and discontinuation strategies in psychotic disorders."
  ["project_learn_source"]=>
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    ["first_name"]=>
    string(6) "Robert"
    ["last_name"]=>
    string(10) "McCutcheon"
    ["degree"]=>
    string(3) "PhD"
    ["primary_affiliation"]=>
    string(17) "Oxford University"
    ["email"]=>
    string(32) "robert.mccutcheon@psych.ox.ac.uk"
    ["state_or_province"]=>
    string(6) "Oxford"
    ["country"]=>
    string(14) "United Kingdom"
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      ["p_pers_f_name"]=>
      string(6) "Krisya"
      ["p_pers_l_name"]=>
      string(5) "Louie"
      ["p_pers_degree"]=>
      string(3) "MSc"
      ["p_pers_pr_affil"]=>
      string(31) "Chinese University of Hong Kong"
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      ["requires_data_access"]=>
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      ["p_pers_l_name"]=>
      string(7) "Mercado"
      ["p_pers_degree"]=>
      string(2) "BS"
      ["p_pers_pr_affil"]=>
      string(17) "Oxford University"
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      ["requires_data_access"]=>
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  ["project_ext_grants"]=>
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    ["value"]=>
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    ["label"]=>
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  ["property_scientific_abstract"]=>
  string(1660) "Background:
Relapse following antipsychotic discontinuation remains a major challenge in the treatment of schizophrenia and related psychotic disorders. While maintenance therapy reduces relapse risk, prolonged exposure may be associated with functional and metabolic burden. There is limited understanding of individual differences in relapse trajectories and predictors of functioning across treatment and withdrawal phases.

Objective:
To identify trajectories of relapse following antipsychotic discontinuation and to determine baseline and dynamic predictors of functional outcomes during acute treatment and after treatment withdrawal.

Study Design:
Secondary analysis of individual participant-level data from Janssen-sponsored randomized controlled trials of antipsychotic medications, including acute and maintenance phases with discontinuation or withdrawal arms.

Participants:
Adults with schizophrenia or related psychotic disorders enrolled in relevant clinical trials, with available data on treatment exposure, discontinuation, and functional and symptom outcomes.

Primary and Secondary Outcome Measure(s):
Primary: Time to relapse and latent trajectory patterns of relapse post-discontinuation.
Secondary: Functioning scores (e.g., PSP, SOFAS, GAF) at baseline, end of acute treatment, and post-withdrawal; clinical and demographic predictors of functional change.

Statistical Analysis:
Latent class modeling will identify relapse trajectories. Mixed-effects and regression models will examine predictors of functioning. " ["project_brief_bg"]=> string(3024) "Relapse following antipsychotic discontinuation is one of the most pressing challenges in the long-term management of schizophrenia and related psychotic disorders. Although continuous maintenance therapy reduces relapse risk, indefinite antipsychotic exposure can lead to cumulative adverse effects, including metabolic and neurological burdens. Determining who benefits from ongoing treatment versus who can safely discontinue remains an unresolved and clinically critical question.

Existing evidence suggests that relapse after discontinuation is not uniform some patients relapse rapidly, others after a delay, and some maintain stability for extended periods. It is not clear if some relapses after antipsychotic discontinuation reflect a withdrawal type reaction as opposed to an illness relapse. To determine this we need to analyse withdrawal trajectories using using large, participant-level datasets. Similarly, functional recovery—an outcome distinct from symptomatic improvement—remains underexplored, particularly regarding predictors of functional change during both acute treatment and the discontinuation phase. Understanding the interplay between symptom remission, functioning, and relapse could inform individualized approaches to maintenance and withdrawal strategies.

Antipsychotic clinical trial data, offer a unique opportunity to address these questions using rigorously collected, high-quality participant-level data across multiple compounds, phases, and study designs. By leveraging this resource, the proposed project will:

Characterize relapse trajectories following antipsychotic discontinuation vs continuation using data-driven approaches (e.g., latent class modeling).

Identify predictors of functioning both at baseline and longitudinally during acute treatment and after discontinuation, considering clinical, demographic, and treatment-related factors.


The results of this research will materially enhance generalizable scientific and clinical understanding by defining patterns of relapse and recovery, informing predictive models for clinical decision-making, and guiding the design of future trials focused on treatment duration and discontinuation strategies. Insights gained will support precision psychiatry initiatives aimed at reducing unnecessary exposure to antipsychotics while maintaining stability and promoting functional recovery.

1. Wunderink, L., Nieboer, R. M., Wiersma, D., Sytema, S. & Nienhuis, F. J. Recovery in Remitted First-Episode Psychosis at 7 Years of Follow-up of an Early Dose Reduction/Discontinuation or Maintenance Treatment Strategy: Long-term Follow-up of a 2-Year Randomized Clinical Trial. JAMA Psychiatry 1–8 (2013).
2. McCutcheon, R. A. et al. Does Slow and Steady Win the Race? Rates of Antipsychotic Discontinuation, Antipsychotic Dose, and Risk of Psychotic Relapse. Schizophr. Bull. (2023) doi:10.1093/schbul/sbad139.
" ["project_specific_aims"]=> string(1436) "Relapse after antipsychotic discontinuation remains a major challenge in the management of schizophrenia and related psychotic disorders, yet the contribution of treatment withdrawal itself versus underlying illness vulnerability remains unclear. Functional recovery is equally important but less well understood, particularly regarding how clinical and demographic factors predict functioning both during treatment and after withdrawal.

Aim 1: To characterize and compare relapse trajectories between antipsychotic continuation and discontinuation.
Using individual participant data randomized controlled trials, we will model relapse trajectories across treatment arms employing latent class modeling. We aim to determine whether relapse timing, trajectory shape, and subgroup membership differ between continuation and discontinuation groups, thereby quantifying the extent to which withdrawal itself contributes to relapse risk beyond illness progression.

Aim 2: To identify predictors of functioning during acute treatment and following discontinuation.
We will examine baseline (e.g., demographics, symptom severity, cognitive status) and dynamic (e.g., symptom change, adherence, treatment duration) predictors of functioning as measured by PSP, SOFAS, or GAF scores. Mixed-effects and regression models will assess predictors of both baseline functioning and change over time.
" ["project_study_design"]=> array(2) { ["value"]=> string(14) "indiv_trial_an" ["label"]=> string(25) "Individual trial analysis" } ["project_purposes"]=> array(2) { [0]=> array(2) { ["value"]=> string(34) "research_on_clinical_trial_methods" ["label"]=> string(34) "Research on clinical trial methods" } [1]=> array(2) { ["value"]=> string(50) "research_on_clinical_prediction_or_risk_prediction" ["label"]=> string(50) "Research on clinical prediction or risk prediction" } } ["project_research_methods"]=> string(426) "Data sources will be randomised controlled trials of antipsychotics in the treatment of schizophrenia

Patients will have:

Diagnosis of schizophrenia, psychosis, or schizoaffective disorder
Age ≥18
Availability of longitudinal clinical and functional measures

Exclusion criteria: Age <18, diagnoses other than schizophrenia, psychosis, or schizoaffective disorder" ["project_main_outcome_measure"]=> string(240) "Primary outcome measure: Relapse
Positive and Negative Syndrome Scale: Total score, subscales, and individual items
Functional measures: Personal and Social Performance Scale, Global Assessment of Functioning,

" ["project_main_predictor_indep"]=> string(465) "Positive and Negative Syndrome Scale: Total score and subscales (positive, negative, general)
Barnes Akathisia Rating Scale
Brief Assessment of Cognition in Schizophrenia
Abnormal Involuntary Movement Scale
Simpson Angus Scale
Schizophrenia Quality of Life Scale
Clinical Global Impression
Personal and Social Performance Scale
Laboratory markers
Age
Gender
Race/Ethinicity
Weight" ["project_other_variables_interest"]=> string(40) "The above covers all relevant variables" ["project_stat_analysis_plan"]=> string(1045) "Descriptive analyses will summarize baseline and clinical characteristics by treatment arm (continuation vs. discontinuation). Bivariate tests (t-tests, χ², correlations) will examine relationships among predictors, relapse, and functioning.
For the primary analysis, relapse trajectories following discontinuation will be identified using latent class modeling, allowing detection of distinct relapse patterns over time. We will compare the proportion of latent classes between continuation and discontinuation groups to assess how much relapse trajectories rather than overall risk of relapse are shaped by withdrawal. Symptom profiles (e.g., PANSS, CGI) will be compared both between arms and across latent classes to clarify clinical differences among trajectory groups.
Secondary analyses will examine predictors of functioning (e.g., PSP, SOFAS, GAF) using linear mixed-effects and multivariable regression models, incorporating baseline and time-varying covariates such as symptom severity and treatment duration.
" ["project_software_used"]=> array(3) { [0]=> array(2) { ["value"]=> string(6) "python" ["label"]=> string(6) "Python" } [1]=> array(2) { ["value"]=> string(1) "r" ["label"]=> string(1) "R" } [2]=> array(2) { ["value"]=> string(7) "rstudio" ["label"]=> string(7) "RStudio" } } ["project_timeline"]=> string(95) "3 months - data cleaning
2 months -data analysis
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2025-0740

General Information

How did you learn about the YODA Project?: Scientific Publication

Conflict of Interest

Request Clinical Trials

Associated Trial(s):
  1. NCT00566631 - Tolerability, Safety and Treatment Response of Flexible Doses of Paliperidone ER in Acutely Exacerbated Subjects With Schizophrenia
  2. NCT00105326 - A Double-blind, Placebo-controlled, Randomized Study Evaluating the Effect of Paliperidone ER Compared With Placebo on Sleep Architecture in Subjects With Schizophrenia
  3. NCT00524043 - A Randomized, Double-Blind, Placebo- and Active-Controlled, Parallel-Group Study to Evaluate the Efficacy and Safety of a Fixed Dosage of 1.5 mg/Day of Paliperidone Extended Release (ER) in the Treatment of Subjects With Schizophrenia
  4. NCT01662310 - Paliperidone Extended Release Tablets for the Prevention of Relapse in Subjects With Schizophrenia: A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study
  5. NCT00085748 - A Randomized, 6-Week Double-Blind, Placebo-Controlled Study With an Optional 24-Week Open-Label Extension to Evaluate the Safety and Tolerability of Flexible Doses of Paliperidone Extended Release in the Treatment of Geriatric Patients With Schizophrenia
  6. NCT00078039 - Trial Evaluating Three Fixed Dosages of Paliperidone Extended-Release (ER) Tablets and Olanzapine in the Treatment of Patients With Schizophrenia
  7. NCT00083668 - A Randomized, Double-blind, Placebo- and Active-controlled, Parallel-group, Dose-response Study to Evaluate the Efficacy and Safety of 3 Fixed Dosages of Paliperidone Extended Release (ER) Tablets and Olanzapine, With Open-label Extension, in the Treatment of Patients With Schizophrenia
  8. NCT00077714 - A Randomized, Double-blind, Placebo- and Active-controlled, Parallel-group, Dose-response Study to Evaluate the Efficacy and Safety of 2 Fixed Dosages of Paliperidone Extended Release Tablets and Olanzapine, With Open-label Extension, in the Treatment of Patients With Schizophrenia
  9. NCT00752427 - 24 week extension of NCT00085748: A Randomized, 6-Week Double-Blind, Placebo-Controlled Study With an Optional 24-Week Open-Label Extension to Evaluate the Safety and Tolerability of Flexible Doses of Paliperidone Extended Release in the Treatment of Geriatric Patients With Schizophrenia
  10. NCT00412373 - A Randomized, Double-blind, Placebo-controlled, Parallel- Group Study to Evaluate the Efficacy and Safety of Flexible-dose Paliperidone ER in the Treatment of Patients With Schizoaffective Disorder
  11. NCT00397033 - A Randomized, Double-blind, Placebo-controlled, Parallel-group Study to Evaluate the Efficacy and Safety of Two Dosages of Paliperidone ER in the Treatment of Patients With Schizoaffective Disorder
  12. NCT00086320 - A Randomized, Double-blind, Placebo-controlled, Parallel-group Study With an Open-label Extension Evaluating Paliperidone Extended Release Tablets in the Prevention of Recurrence in Subjects With Schizophrenia
  13. NCT00334126 - A Randomized, Double-blind, Placebo-controlled, Parallel Group Study to Evaluate the Efficacy and Safety of Paliperidone ER Compared to Quetiapine in Subjects With an Acute Exacerbation of Schizophrenia
  14. Risperidone versus haloperidol in the treatment of chronic psychotic patients: a multicentre, double-blind study
  15. Open-label Study Exploring a Switching Regimen From Depot Neuroleptics to Risperidone Depot Microspheres
  16. NCT00297388 - A 52-wk Prospective, Randomized, Double-blind, Multicenter Study of Relapse Following Transition From Oral Antipsychotic Medication to 2 Different Doses (25 or 50 mg Every 2 Wks) of Risperidone Long-acting Microspheres (RISPERDAL CONSTA) in Adults With Schizophrenia or Schizoaffective Disorder
  17. NCT00236379 - A Six-month, Double-blind, Randomized, International, Multicenter Trial to Evaluate the Glucoregulatory Effects of Risperidone and Olanzapine in Subjects With Schizophrenia or Schizoaffective Disorder
  18. NCT00369239 - Is Premorbid Functioning a Predictor of Outcome in Patients With Early Onset Psychosis Treated With Risperdal Consta?
  19. NCT00216671 - Early Versus Late Initiation of Treatment With Risperdal Consta in Subjects With Schizophrenia After an Acute Episode
  20. NCT00249223 - Risperidone Depot (Microspheres) vs. Risperidone Tablets - a Non-inferiority, Efficacy Trial in Subjects With Schizophrenia
  21. The safety and efficacy of risperidone 8 mg qd and 4 mg qd compared to placebo in the treatment of schizophrenia
  22. NCT00253136 - Risperidone Depot (Microspheres) vs. Placebo in the Treatment of Subjects With Schizophrenia
  23. Risperidone versus haloperidol versus placebo in the treatment of schizophrenia
  24. NCT00088075 - A Randomized, Double-Blind, Placebo-Controlled Clinical Study of the Efficacy and Safety of Risperidone for the Treatment of Schizophrenia in Adolescents
  25. NCT00378092 - A Prospective Study of the Clinical Outcome Following Treatment Discontinuation After Remission in First-Episode Schizophrenia
  26. NCT00216476 - CONSTATRE: Risperdal® Consta® Trial of Relapse Prevention and Effectiveness
  27. NCT00249132 - A Canadian multicenter placebo-controlled study of fixed doses of risperidone and haloperidol in the treatment of chronic schizophrenic patients
  28. NCT00034749 - The Efficacy and Safety of Risperidone in Adolescents With Schizophrenia: a Comparison of Two Dose Ranges of Risperidone
  29. NCT03345342 - A Double-blind, Randomized, Active-controlled, Parallel-group Study of Paliperidone Palmitate 6-Month Formulation
  30. NCT01515423 - A Randomized, Multicenter, Double-Blind, Non-inferiority Study of Paliperidone Palmitate 3 Month and 1 Month Formulations for the Treatment of Subjects With Schizophrenia
  31. NCT01299389 - A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Fixed-Dose, Multicenter Study of JNS010 (Paliperidone Palmitate) in Patients With Schizophrenia
  32. NCT01193153 - A Randomized, Double-Blind, Placebo-Controlled, Parellel-Group Study of Paliperidone Palmitate Evaluating Time to Relapse in Subjects With Schizoaffective Disorder
  33. NCT01529515 - A Randomized, Multicenter, Double-Blind, Relapse Prevention Study of Paliperidone Palmitate 3 Month Formulation for the Treatment of Subjects With Schizophrenia
  34. NCT00074477 - A Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy and Safety of 50 and 100 Mg-eq of Paliperidone Palmitate in Patients With Schizophrenia
  35. NCT00101634 - A Randomized, Double-blind, Placebo-controlled, Parallel-group, Dose-response Study to Evaluate the Efficacy and Safety of 3 Fixed Doses (25 mg eq, 50 mg eq, and 100 mg eq) of Paliperidone Palmitate in Patients With Schizophrenia
  36. NCT00210548 - A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Dose-Response Study to Evaluate the Efficacy and Safety of 3 Fixed Doses (50 mg eq., 100 mg eq., and 150 mg eq.) of Paliperidone Palmitate in Subjects With Schizophrenia
  37. NCT00210717 - A Randomized, Double-Blind, Parallel Group, Comparative Study of Flexibly Dosed Paliperidone Palmitate (25, 50, 75, or 100 mg eq.) Administered Every 4 Weeks and Flexibly Dosed RISPERDAL CONSTA (25, 37.5, or 50 mg) Administered Every 2 Weeks in Subjects With Schizophrenia
  38. NCT00111189 - A Randomized Double-blind Placebo-controlled Parallel Group Study Evaluating Paliperidone Palmitate in the Prevention of Recurrence in Patients With Schizophrenia. Placebo Consists of 20% Intralipid (200 mg/mL) Injectable Emulsion
  39. NCT00590577 - A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Dose Response Study to Evaluate the Efficacy and Safety of 3 Fixed Doses (25 mg eq., 100 mg eq., and 150 mg eq.) of Paliperidone Palmitate in Subjects With Schizophrenia
  40. NCT00589914 - A Randomized, Double-Blind, Parallel-Group, Comparative Study of Flexible Doses of Paliperidone Palmitate and Flexible Doses of Risperidone Long-Acting Intramuscular Injection in Subjects With Schizophrenia
What type of data are you looking for?: Individual Participant-Level Data, which includes Full CSR and all supporting documentation

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Data Request Status

Status: Ongoing

Research Proposal

Project Title: Trajectories of Relapse and Predictors of Functioning in Antipsychotic Clinical Trials

Scientific Abstract: Background:
Relapse following antipsychotic discontinuation remains a major challenge in the treatment of schizophrenia and related psychotic disorders. While maintenance therapy reduces relapse risk, prolonged exposure may be associated with functional and metabolic burden. There is limited understanding of individual differences in relapse trajectories and predictors of functioning across treatment and withdrawal phases.

Objective:
To identify trajectories of relapse following antipsychotic discontinuation and to determine baseline and dynamic predictors of functional outcomes during acute treatment and after treatment withdrawal.

Study Design:
Secondary analysis of individual participant-level data from Janssen-sponsored randomized controlled trials of antipsychotic medications, including acute and maintenance phases with discontinuation or withdrawal arms.

Participants:
Adults with schizophrenia or related psychotic disorders enrolled in relevant clinical trials, with available data on treatment exposure, discontinuation, and functional and symptom outcomes.

Primary and Secondary Outcome Measure(s):
Primary: Time to relapse and latent trajectory patterns of relapse post-discontinuation.
Secondary: Functioning scores (e.g., PSP, SOFAS, GAF) at baseline, end of acute treatment, and post-withdrawal; clinical and demographic predictors of functional change.

Statistical Analysis:
Latent class modeling will identify relapse trajectories. Mixed-effects and regression models will examine predictors of functioning.

Brief Project Background and Statement of Project Significance: Relapse following antipsychotic discontinuation is one of the most pressing challenges in the long-term management of schizophrenia and related psychotic disorders. Although continuous maintenance therapy reduces relapse risk, indefinite antipsychotic exposure can lead to cumulative adverse effects, including metabolic and neurological burdens. Determining who benefits from ongoing treatment versus who can safely discontinue remains an unresolved and clinically critical question.

Existing evidence suggests that relapse after discontinuation is not uniform some patients relapse rapidly, others after a delay, and some maintain stability for extended periods. It is not clear if some relapses after antipsychotic discontinuation reflect a withdrawal type reaction as opposed to an illness relapse. To determine this we need to analyse withdrawal trajectories using using large, participant-level datasets. Similarly, functional recovery--an outcome distinct from symptomatic improvement--remains underexplored, particularly regarding predictors of functional change during both acute treatment and the discontinuation phase. Understanding the interplay between symptom remission, functioning, and relapse could inform individualized approaches to maintenance and withdrawal strategies.

Antipsychotic clinical trial data, offer a unique opportunity to address these questions using rigorously collected, high-quality participant-level data across multiple compounds, phases, and study designs. By leveraging this resource, the proposed project will:

Characterize relapse trajectories following antipsychotic discontinuation vs continuation using data-driven approaches (e.g., latent class modeling).

Identify predictors of functioning both at baseline and longitudinally during acute treatment and after discontinuation, considering clinical, demographic, and treatment-related factors.


The results of this research will materially enhance generalizable scientific and clinical understanding by defining patterns of relapse and recovery, informing predictive models for clinical decision-making, and guiding the design of future trials focused on treatment duration and discontinuation strategies. Insights gained will support precision psychiatry initiatives aimed at reducing unnecessary exposure to antipsychotics while maintaining stability and promoting functional recovery.

1. Wunderink, L., Nieboer, R. M., Wiersma, D., Sytema, S. & Nienhuis, F. J. Recovery in Remitted First-Episode Psychosis at 7 Years of Follow-up of an Early Dose Reduction/Discontinuation or Maintenance Treatment Strategy: Long-term Follow-up of a 2-Year Randomized Clinical Trial. JAMA Psychiatry 1--8 (2013).
2. McCutcheon, R. A. et al. Does Slow and Steady Win the Race? Rates of Antipsychotic Discontinuation, Antipsychotic Dose, and Risk of Psychotic Relapse. Schizophr. Bull. (2023) doi:10.1093/schbul/sbad139.

Specific Aims of the Project: Relapse after antipsychotic discontinuation remains a major challenge in the management of schizophrenia and related psychotic disorders, yet the contribution of treatment withdrawal itself versus underlying illness vulnerability remains unclear. Functional recovery is equally important but less well understood, particularly regarding how clinical and demographic factors predict functioning both during treatment and after withdrawal.

Aim 1: To characterize and compare relapse trajectories between antipsychotic continuation and discontinuation.
Using individual participant data randomized controlled trials, we will model relapse trajectories across treatment arms employing latent class modeling. We aim to determine whether relapse timing, trajectory shape, and subgroup membership differ between continuation and discontinuation groups, thereby quantifying the extent to which withdrawal itself contributes to relapse risk beyond illness progression.

Aim 2: To identify predictors of functioning during acute treatment and following discontinuation.
We will examine baseline (e.g., demographics, symptom severity, cognitive status) and dynamic (e.g., symptom change, adherence, treatment duration) predictors of functioning as measured by PSP, SOFAS, or GAF scores. Mixed-effects and regression models will assess predictors of both baseline functioning and change over time.

Study Design: Individual trial analysis

What is the purpose of the analysis being proposed? Please select all that apply.: Research on clinical trial methods Research on clinical prediction or risk prediction

Software Used: Python, R, RStudio

Data Source and Inclusion/Exclusion Criteria to be used to define the patient sample for your study: Data sources will be randomised controlled trials of antipsychotics in the treatment of schizophrenia

Patients will have:

Diagnosis of schizophrenia, psychosis, or schizoaffective disorder
Age >=18
Availability of longitudinal clinical and functional measures

Exclusion criteria: Age <18, diagnoses other than schizophrenia, psychosis, or schizoaffective disorder

Primary and Secondary Outcome Measure(s) and how they will be categorized/defined for your study: Primary outcome measure: Relapse
Positive and Negative Syndrome Scale: Total score, subscales, and individual items
Functional measures: Personal and Social Performance Scale, Global Assessment of Functioning,

Main Predictor/Independent Variable and how it will be categorized/defined for your study: Positive and Negative Syndrome Scale: Total score and subscales (positive, negative, general)
Barnes Akathisia Rating Scale
Brief Assessment of Cognition in Schizophrenia
Abnormal Involuntary Movement Scale
Simpson Angus Scale
Schizophrenia Quality of Life Scale
Clinical Global Impression
Personal and Social Performance Scale
Laboratory markers
Age
Gender
Race/Ethinicity
Weight

Other Variables of Interest that will be used in your analysis and how they will be categorized/defined for your study: The above covers all relevant variables

Statistical Analysis Plan: Descriptive analyses will summarize baseline and clinical characteristics by treatment arm (continuation vs. discontinuation). Bivariate tests (t-tests, χ^2, correlations) will examine relationships among predictors, relapse, and functioning.
For the primary analysis, relapse trajectories following discontinuation will be identified using latent class modeling, allowing detection of distinct relapse patterns over time. We will compare the proportion of latent classes between continuation and discontinuation groups to assess how much relapse trajectories rather than overall risk of relapse are shaped by withdrawal. Symptom profiles (e.g., PANSS, CGI) will be compared both between arms and across latent classes to clarify clinical differences among trajectory groups.
Secondary analyses will examine predictors of functioning (e.g., PSP, SOFAS, GAF) using linear mixed-effects and multivariable regression models, incorporating baseline and time-varying covariates such as symptom severity and treatment duration.

Narrative Summary: This project will analyze Janssen antipsychotic clinical trial data to examine trajectories of relapse following treatment discontinuation and to identify predictors of functioning. Using individual participant data, we will model heterogeneity in relapse timing after withdrawal. We will also examine baseline demographic and clinical features as predictors of functioning and relapse risk. The findings aim to clarify who benefits most from continued antipsychotic treatment and who may maintain stability after discontinuation, supporting more personalized maintenance and discontinuation strategies in psychotic disorders.

Project Timeline: 3 months - data cleaning
2 months -data analysis
4 months- manuscript preparation

Dissemination Plan: Findings will be disseminated via publication in clinical journals (e.g. JAMA Psychiatry, Lancet Psychiatry) and presentation at scientific conferences (e.g. Schizophrenia International Reserach Society)

Bibliography: