Dataset Information

Accounting for group differences in study retention in a randomized trial of specialized treatment for first episode psychosis.

ABSTRACT:

Background

Schizophrenia is a chronic disabling disorder for which current treatments are only partially effective. While the evaluation of novel interventions is a high priority, loss to follow-up is a major threat to validity.

Methods

Pattern mixture modeling is a statistical technique that incorporates information on patterns of retention that may bias comparisons between randomized treatment groups. This study used pattern mixture mixed model (PMMM) in the analysis of outcomes of a two-year cluster-randomized trial, the Recovery after an Initial Schizophrenia Episode-Early Treatment Program, which compared a coordinated specialty care intervention called NAVIGATE to usual community care (CC). PMM-adjusted outcome differences between NAVIGATE and CC were estimated by the weighted-average of effects across the retention patterns.

Results

Compared to the original analysis, PMMM improved model fit and the estimated effectiveness of NAVIGATE as compared to CC. On the Quality of Life Scale NAVIGATE effectiveness increased by 1.50 points (25.4%); on the Positive and Negative Syndrome Scale, by 1.72 points (39.8%), and on the Calgary Depression Scale by 0.49 points (62.1%). PMMM did not improve model fit for employment days, substance use days, or hospital days.

Conclusion

Use of PMMM improved model fit and increased the estimated differences between NAVIGATE and CC for major outcomes. Patients with differential retention patterns may have different outcome trajectories. PMMM is a useful tool for addressing potential biases arising from these differences.

SUBMITTER: Sint K

PROVIDER: S-EPMC5826785 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature

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Publications

Accounting for group differences in study retention in a randomized trial of specialized treatment for first episode psychosis.

Sint Kyaw K Rosenheck Robert R Robinson Delbert G DG Schooler Nina R NR Marcy Patricia P Kane John M JM Mueser Kim T KT Lin Haiqun H

Schizophrenia research 20170825

<h4>Background</h4>Schizophrenia is a chronic disabling disorder for which current treatments are only partially effective. While the evaluation of novel interventions is a high priority, loss to follow-up is a major threat to validity.<h4>Methods</h4>Pattern mixture modeling is a statistical technique that incorporates information on patterns of retention that may bias comparisons between randomized treatment groups. This study used pattern mixture mixed model (PMMM) in the analysis of outcomes ...[more]

PMID: 28844431

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Project description:BACKGROUND:Facial emotion recognition (FER) is essential to guide social functioning and behaviour for interpersonal communication. FER may be altered in severe mental illness such as in psychosis and in borderline personality disorder patients. However, it is unclear if these FER alterations are specifically related to psychosis. Awareness of FER alterations may be useful in clinical settings to improve treatment strategies. The aim of our study was to examine FER in patients with severe mental disorder and their relation with psychotic symptomatology. MATERIALS AND METHODS:Socio-demographic and clinical variables were collected. Alterations on emotion recognition were assessed in 3 groups: patients with first episode psychosis (FEP) (n = 64), borderline personality patients (BPD) (n = 37) and healthy controls (n = 137), using the Degraded Facial Affect Recognition Task. The Positive and Negative Syndrome Scale, Structured Interview for Schizotypy Revised and Community Assessment of Psychic Experiences scales were used to assess positive psychotic symptoms. WAIS III subtests were used to assess IQ. RESULTS:Kruskal-Wallis analysis showed a significant difference between groups on the FER of neutral faces score between FEP, BPD patients and controls and between FEP patients and controls in angry face recognition. No significant differences were found between groups in the fear or happy conditions. There was a significant difference between groups in the attribution of negative emotion to happy faces. BPD and FEP groups had a much higher tendency to recognize happy faces as negatives. There was no association with the different symptom domains in either group. CONCLUSIONS:FEP and BPD patients have problems in recognizing neutral faces more frequently than controls. Moreover, patients tend to over-report negative emotions in recognition of happy faces. Although no relation between psychotic symptoms and FER alterations was found, these deficits could contribute to a patient's misinterpretations in daily life.

Project description:While sex differences in schizophrenia have long been reported and discussed, long-term sex differences in outcomes among first episode of psychosis (FEP) patients in terms of the efficacy of Early Intervention Services (EIS) has been an under-explored area. A total of 209 FEP patients (95 females and 114 males) were reassessed after a time window ranging from 8 to 16 years after their first contact with an EIS program (PAFIP) that we will call the 10-year PAFIP cohort. Multiple clinical, cognitive, functioning, premorbid, and sociodemographic variables were explored at 1-year, 3-year and 10-year follow-ups. At first contact, females were older at illness onset, had higher premorbid adjustment and IQ, and were more frequently employed, living independently, and accompanied by a partner and/or children. Existence of a schizophrenia diagnosis, and cannabis and alcohol consumption were more probable among men. During the first 3 years, women showed a significantly better response to minimal antipsychotic dosages and higher rates of recovery than men (50% vs. 30.8%). Ten years later, more females continued living independently and had partners, while schizophrenia diagnoses and cannabis consumption continued to be more frequent among men. Females also presented a lower severity of negative symptoms; however, functionality and recovery differences did not show significant differences (46.7% vs. 34.4%). Between the 3- and 10-year follow-up sessions, an increase in dosage of antipsychotics was observed. These results suggest that the better outcomes seen among women during the first 3 years (while they were treated in an EIS) were in the presence of more favourable premorbid and baseline characteristics. After an average period of 10 years, with the only difference being in negative symptoms course, outcomes for women approximated those of men, drawing particular attention to the increase in dosage of antipsychotic medication once FEP patients were discharged from the EIS program towards community-based services. These findings help to pose the question of whether it is advisable to target sexes and lengthen EIS interventions.

Dataset Information

Accounting for group differences in study retention in a randomized trial of specialized treatment for first episode psychosis.

Background

Methods

Results

Conclusion

Publications

Accounting for group differences in study retention in a randomized trial of specialized treatment for first episode psychosis.

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