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Int J Epidemiol. 2019 Jul 1. pii: dyz134. doi: 10.1093/ije/dyz134. [Epub ahead of print]

Factors associated with sharing e-mail information and mental health survey participation in large population cohorts.

Author information

1
Division of Psychiatry, Royal Edinburgh Hospital, Edinburgh, UK.
2
Centre for Cognitive Ageing and Cognitive Epidemiology, Edinburgh, UK.
3
Department of Psychology, University of Edinburgh, Edinburgh, UK.
4
Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.
5
Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA, USA.
6
South London and Maudsley NHS Foundation Trust, London, UK.
7
NIHR Biomedical Research Centre, London, UK.
8
Centre for Genomic and Experimental Medicine, Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, UK.
9
Usher Institute for Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK.
10
MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, UK.

Abstract

BACKGROUND:

People who opt to participate in scientific studies tend to be healthier, wealthier and more educated than the broader population. Although selection bias does not always pose a problem for analysing the relationships between exposures and diseases or other outcomes, it can lead to biased effect size estimates. Biased estimates may weaken the utility of genetic findings because the goal is often to make inferences in a new sample (such as in polygenic risk score analysis).

METHODS:

We used data from UK Biobank, Generation Scotland and Partners Biobank and conducted phenotypic and genome-wide association analyses on two phenotypes that reflected mental health data availability: (i) whether participants were contactable by e-mail for follow-up; and (ii) whether participants responded to follow-up surveys of mental health.

RESULTS:

In UK Biobank, we identified nine genetic loci associated (P <5 × 10-8) with e-mail contact and 25 loci associated with mental health survey completion. Both phenotypes were positively genetically correlated with higher educational attainment and better health and negatively genetically correlated with psychological distress and schizophrenia. One single nucleotide polymorphism association replicated along with the overall direction of effect of all association results.

CONCLUSIONS:

Re-contact availability and follow-up participation can act as further genetic filters for data on mental health phenotypes.

KEYWORDS:

Generation Scotland; Partners Biobank; Selection bias; UK Biobank; cohort studies; follow-up studies; genome-wide association study; mental health

PMID:
31263887
DOI:
10.1093/ije/dyz134

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