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The authors of the study acknowledged that the evaluation scale that they used may not have been appropriate for studies on meditation, which would have affected the rating of quality: "The scale, however, may be criticized as being unsuited for the evaluation of nonpharmacological interventions such as meditation, where blinding of the subjects to the identity of the treatment they are receiving is likely to interfere with treatment effectiveness. Likewise, the Jadad scale does not evaluate the effectiveness of treatment implementation." , Maria Ospina, et al, "Clinical Trials of Meditation Practices in Health Care: Characteristics and Quality," THE JOURNAL OF ALTERNATIVE AND COMPLEMENTARY MEDICINE Volume 14, Number 10, 2008, pp. 1210