Introduction: The Ayurvedic theory of Tri-Dosha offers a unique framework for understanding human differences in health and disease. The Doshas could be readily applied in clinical studies to control for such differences the same way sex, age, height and weight are routinely used except that clinical evaluation is required and methods vary. No open-source questionnaire has been shown to be reliable for self-assessment. Therefore, we undertook this study to develop a reliable Dosha self-assessment questionnaire with characteristics suitable for use in clinical research.
Methods: A review of published questionnaires and translations of classic Ayurvedic texts along with an analysis of item-total correlations and ANOVAs by Dosha for 735 responses to a 37-item ipsative questionnaire from an Ayurveda products company served as the basis for generating 108 Dosha-specific test items featuring a 7-point Likert scale. We used item-total and inter-item correlations from a convenience sample of 176 individuals to identify the best performing items. We then solicited repeat responses to the resultant 39-item questionnaire (13 for each Dosha) from these and other website visitors and calculated test-retest reliability as the intraclass correlation coefficient for absolute agreement (ICC 2,1) for each Dosha.
Results: The final questionnaire gives normally distributed results. Among 76 self-selected adults, the test-retest reliabilities for Vata, Pitta and Kapha Dosha scores are all above 0.8.
Conclusions: This study demonstrates that it is possible to quantify the three Doshas with adequate reliability for most clinical studies.
Keywords: Dosha; Prakriti; Questionnaire; Reliability; Self-assessment.
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