A yoga and diabetes study asks for a careful reading
A cross-sectional comparison finds differences between yoga practitioners and non-practitioners without establishing their cause.
A La Clinica Terapeutica paper compares 236 adults with type 2 diabetes: 79 regular yoga practitioners and 157 non-practitioners. The journal lists publication on October 22 in its November and December issue. It is an observational, cross-sectional study.
A difference is not an explanation
The yoga group had lower measured fasting glucose and HbA1c, alongside differences in several other metabolic and psychological measures. These are comparisons between existing groups at one point in time. Participants were not randomly assigned to begin yoga.
The authors call for prospective randomised studies to establish causality. That qualification belongs beside the findings. People who maintain a yoga practice may differ from non-practitioners in other ways; the comparison cannot determine whether yoga produced the measured differences.
For teachers discussing research with students, this is a concrete example of the distinction between an association and an intervention result. The paper describes a pattern worth investigating. It does not justify promising a change in an individual student’s blood sugar, or using the group comparison to direct someone’s medical care.
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