The Essential Properties of Yoga Questionnaire: Development and Methods

Area of Science:

• Integrative and Complementary Medicine
• Health Services Research
• Psychometrics

Background:

• Yoga interventions are heterogeneous and multi-dimensional, making comparisons difficult.
• Current research often fails to adequately describe yoga intervention components.
• This lack of detail hinders understanding of yoga's effects on health and well-being.

Purpose of the Study:

• To develop a translational tool, the Essential Properties of Yoga Questionnaire (EPYQ), for yoga researchers.
• To provide an objective method for describing components of yoga interventions.
• To facilitate linking specific yoga elements to health outcomes.

Main Methods:

• A four-phase project including systematic literature review and stakeholder focus groups (Phase I).
• Development of a prototypic questionnaire with cognitive interviews (Phase II).
• Factor analysis and item response theory on data from 329 yoga practitioners and instructors (Phase III).

Main Results:

• A comprehensive understanding of relevant yoga aspects was gathered.
• A pool of questionnaire items was developed and refined through cognitive interviews.
• Factor analysis and item response theory were used to select final items for the EPYQ.

Conclusions:

• The Essential Properties of Yoga Questionnaire (EPYQ) project successfully developed a tool to standardize yoga intervention descriptions.
• The EPYQ will enable researchers to link specific yoga components to health benefits.
• This tool will facilitate the design of yoga interventions for specific health conditions.