University of Washington Twin Registry: construction and characteristics of a community-based twin registry

The University of Washington Twin Registry is a community-based registry of twins identified from the Washington State Department of Licensing. A fortuitous quirk in the Washington State drivers’ license and identification number assignment, and collaborative Washington State laws, permitted us to build a statewide registry. Since obtaining approval from the Washington State Attorney General, the […]

A twin study of posttraumatic stress disorder symptoms and chronic widespread pain

Previous studies of the association between posttraumatic stress disorder (PTSD) and chronic widespread pain (CWP) or fibromyalgia have not examined the role of familial or genetic factors. The goals of this study were to determine if symptoms of PTSD are related to CWP in a genetically informative community-based sample of twin pairs, and if so, […]

Is the association between posttraumatic stress disorder symptoms and poor health due to a common familial or genetic factor?

Objective: The objective of this study was to identify genetic, familial and environmental contributions to the association between posttraumatic stress disorder (PTSD) symptoms and poor health. Methods: A community sample of 1852 twin pairs was assessed for symptoms of PTSD [with the Impact of Events Scale (IES)] and self-reported global health status using a single five-level question. […]

Genetic and environmental influences on insomnia, daytime sleepiness, and obesity in twins

Study objectives: To better understand the relationships of insomnia, sleepiness, and obesity. Design: Classic twin study. Setting: A community-based twin registry in Washington State. Patients or participants: One thousand forty-two monozygotic and 828 dizygotic twin pairs participating in the University of Washington Twin Registry. Interventions: N/A. Measurements and results: Twins were, on average, 32 years old; 61% were women, and 19.5% […]