Key result
Study attrition links to lower socioeconomic status and psychiatric history but preserves original risk estimates.
Why the study?
In epidemiological studies, analyses are needed to investigate the consequences of non-response and attrition.
Observational
Answers are grounded in this paper and cite their sources.
Attrition in the second wave of the PART study underestimated the true prevalence of distress and disorder, but did not substantially bias the associations between determinants and outcomes.
BACKGROUND: In epidemiological studies, analyses are needed to investigate the consequences of non-response. AIMS: To analyse the consequences of attrition in the second wave of the population-based PART study, which was performed three years after the first wave. METHODS: Potential determinants for non-participation obtained from population registers and the first wave were analyzed. The relationships between potential determinants and reduced well-being or depressive mood in the first wave questionnaire were investigated separately for participants and non-participants in the second wave. Samples of respondents to the second wave questionnaire with reduced or not reduced well-being were summoned for interview regarding determinants of distress and disorder. The occurrence of potential determinants was compared between participants and non-participants in both groups. RESULTS: Low income, low education, non-Nordic origin, not being married and previous psychiatric diagnosis were associated with lower participation rates. These variables were similarly related to depressive mood and low psychological well-being in the first wave among participants and non-participants in the second wave. Potential determinants were not or only weakly related to participation in the interview groups. CONCLUSION: Although the true prevalence of distress and disorder is underestimated, the true associations between potential determinants and the outcomes seem reasonably well reproduced.
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Bergman et al. (2010) conducted an observational in Mental disorder. Non-participation (attrition) vs. Participation was evaluated on Relationships between potential determinants and reduced well-being or depressive mood. Non-participation in the second wave was higher among those with low income, low education, and previous psychiatric diagnosis, though determinant-outcome associations were reasonably well reproduced.
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