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January 12, 2005

Relationship of Fitness and Body Mass Index to Cardiac Disease

JAMA. 2005;293(2):161-162. doi:10.1001/jama.293.2.161-b

To the Editor: In their study of the relationship of physical fitness and body mass index to cardiac disease in women, Dr Wessel and colleagues1 incorrectly converted the Duke Activity Status Index (DASI) score to peak metabolic equivalent tasks (METs). The Methods state that the actual score from the DASI questionnaire can be divided by 3.5 to estimate METs. However, the original article on the development of the DASI2 states that weighting of items in the index was based on known metabolic costs, but the sum of the weighted answers must then be converted to VO2 peak in mL/kg per minute using the equation VO2 peak = 0.43 × DASI score + 9.6. METs can then be calculated by dividing the estimated VO2 peak by 3.5.

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