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CARDIA sleep ancillary study: study design and methods.

Kristen L Knutson^1,2, Kathryn J Reid¹, Sunaina Karanth¹

¹Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.

Sleep Advances : a Journal of the Sleep Research Society

|October 24, 2024

Summary

This summary is machine-generated.

This study investigates sleep and circadian rhythm differences between Black and White adults. Researchers aim to identify factors contributing to these disparities using detailed sleep assessments.

Keywords:

design epidemiologic research epidemiologic studies sleep habits social disparity in health

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Area of Science:

Sleep science
Circadian biology
Health disparities research

Background:

Sleep and circadian disturbances are prevalent, disproportionately affecting Black individuals compared to White individuals.
Understanding these disparities is crucial for public health initiatives.
The Coronary Artery Disease in Young Adults (CARDIA) study provides a valuable cohort for investigating these differences.

Purpose of the Study:

To describe the study design and methodology for an ancillary sleep study within the CARDIA cohort.
To lay the groundwork for future analyses examining determinants of sleep and circadian disparities between Black and White adults.
To collect comprehensive data on sleep patterns, quality, and environmental factors.

Main Methods:

An observational, ancillary study conducted in two phases during the CARDIA Year 35 examination.
Phase 1 utilized questionnaires for chronotype, restless legs syndrome, and sleep environment.
Phase 2 incorporated questionnaires for sleep quality, daytime sleepiness, insomnia, wrist actigraphy, and home sleep apnea testing. A subset underwent objective environmental monitoring (light, temperature, sound).

Main Results:

Sample sizes varied by assessment: 2200-2400 for Phase 1 questionnaires, 899 for wrist actigraphy, and 619 for sleep apnea tests.
Data collected include subjective sleep measures, objective sleep-wake patterns, and environmental exposures.
The study successfully gathered diverse sleep-related data from a large cohort.

Conclusions:

The described methodology provides a robust foundation for examining sleep and circadian disparities in a diverse adult population.
The collected data will be integrated into the CARDIA dataset, enabling future research on the determinants of racial disparities in sleep.
This study design facilitates a deeper understanding of the complex factors influencing sleep health across different racial groups.