Is there an "unhealthy volunteer effect" in mental health outpatient research?

Participating in Longitudinal Observational Research on Psychiatric Rehabilitation: Quantitative Results From a Patient Perspective Study

BACKGROUND

Longitudinal observational studies play on an important role for evidence-based research on health services and psychiatric rehabilitation. However, information is missing about the reasons, why patients participate in such studies, and how they evaluate their participation experience.

METHODS

Subsequently to their final assessment in a 2-year follow-up study on supported housing for persons with severe mental illness, n = 182 patients answered a short questionnaire on their study participation experience (prior experiences, participation reasons, burden due to study assessments, intention to participate in studies again). Basic respondent characteristics as well as symptom severity (SCL-K9) were also included in the descriptive and analytical statistics.

RESULTS

To help other people and curiosity were cited as the main initial reasons for study participation (>85%). Further motives were significantly associated with demographic and/or clinical variables. For instance, "relieve from boredom" was more frequently reported by men and patients with substance use disorders (compared to mood disorders), and participants 'motive" to talk about illness" was associated with higher symptom severity at study entry. Furthermore, only a small proportion of respondents indicated significant burdens by study participation and about 87% would also participate in future studies.

CONCLUSIONS

The respondents gave an overall positive evaluation regarding their participation experience in an observational study on psychiatric rehabilitation. The results additionally suggest that health and social care professionals should be responsive to the expectations and needs of patients with mental illness regarding participation in research.

Trial participant representativeness compared to ordinary service users in a work rehabilitation setting

Background

Study representativeness is a major concern for generalizations from trials. The extent of the problem varies with study design and context. There is a strong emphasis on developing interventions to help people remain in the work force despite mental illness. We need to know if results from upcoming trials in this area are valid for those that later might receive the services.

Method

The AWaC trial was a multicenter RCT conducted at six different treatment centers (n = 1193). After the trial was over, the centers were upheld and run as ordinary services. At that time, we surveyed 80 ordinary service users with the same baseline questionnaire as used in the trial, and compared them with those who participated in the trial.

Results

There were a higher proportion of people with the highest level of education (4 years or more at university/college) in the post-trial comparison sample. This sample also reported to be “dissatisfied” with their job more often, but rated their chances for return to work as “bad” less often than the ordinary trial participants. No further significant differences between the two samples in any of the other education categories, or for any of the other demographic, health or work related comparisons were found.

Discussion

Participation bias is likely to depend on study context, but in the setting of a trial to help improve work participation among people who struggle with common mental disorders, the trial participants were overall very similar to those who sought the same services as ordinary practice.

Participation and retention of youth with perinatal HIV infection in mental health research studies: the IMPAACT P1055 psychiatric comorbidity study

BACKGROUND

Obtaining accurate estimates of mental health problems among youth perinatally infected with HIV (PHIV) helps clinicians develop targeted interventions but requires enrollment and retention of representative youth into research studies.

METHODS

The study design for IMPAACT P1055, a US-based, multisite prospective study of psychiatric symptoms among PHIV youth and uninfected controls aged 6 to 17 years old, is described. Participants were compared with nonparticipants by demographic characteristics and reasons were summarized for study refusal. Adjusted logistic regression models were used to evaluate the association of psychiatric symptoms and other factors with loss to follow-up (LTFU).

RESULTS

Among 2281 youth screened between 2005 and 2006 at 29 IMPAACT research sites, 580 (25%) refused to participate, primarily because of time constraints. Among 1162 eligible youth approached, 582 (50%) enrolled (323 PHIV and 259 Control), with higher participation rates for Hispanic youth. Retention at 2 years was significantly higher for PHIV than Controls (84% vs 77%, P = 0.03). In logistic regression models adjusting for sociodemographic characteristics and HIV status, youth with any self-assessed psychiatric condition had higher odds of LTFU compared with those with no disorder (adjusted odds ratio = 1.56, 95% confidence interval: 1.00 to 2.43). Among PHIV youth, those with any psychiatric condition had 3-fold higher odds of LTFU (adjusted odds ratio = 3.11, 95% confidence interval: 1.61 to 6.01).

CONCLUSIONS

Enrollment and retention of PHIV youth into mental health research studies is challenging for those with psychiatric conditions and may lead to underestimated risks for mental health problems. Creative approaches for engaging HIV-infected youth and their families are required for ensuring representative study populations.

Psychometric properties of the Japanese version of the Social Phobia Inventory

AIM

The aim of the current study was to study the psychometric properties of the Japanese version of the Social Phobia Inventory (SPIN-J) among Japanese subjects with social anxiety disorder (SAD).

METHOD

The sample consisted of 86 subjects with SAD and 86 controls. Diagnosis was based on a modified version of the Structured Clinical Interview for the DSM-IV. In addition to the SPIN-J, clinician-administered and self-rating scales, including the Japanese versions of the Liebowitz Social Anxiety Scale, the Social Phobia Scale, and the Social Interaction Anxiety Scale, were used.

RESULTS

The SPIN-J showed adequate internal consistency (0.82-0.96) for the total and subscales. Correlations between the SPIN-J and the Liebowitz Social Anxiety Scale, the Social Phobia Scale, and the Social Interaction Anxiety Scale ranged from 0.83 to 0.89 and indicated adequate concurrent validity. A cut-off point of 22 between subjects with SAD and controls showed a sensitivity of 96.5% and specificity of 87.2%, indicating robust discriminant validity.

CONCLUSION

The SPIN-J showed adequate reliability and validity for use as a screening tool for social anxiety disorder in Japanese clinical settings.

Perceptions of PTSD research participation among patients with severe mental illness

Due to concerns that individuals with severe mental illness (SMI) are too fragile to participate in trauma/PTSD research, we examined reactions to PTSD research participation among these patients. Most patients viewed their participation favorably and were not significantly distressed, suggesting an adequate benefit of trauma/PTSD research participation in this population.