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  1. Larson, Janet L.
  2. Covey, Margaret K.
  3. Vitalo, Candice A.
  4. Alex, Charles G.
  5. Patel, Minu
  6. Kim, Mi Ja


Validity and test-retest reliability of the 12-minute distance (12MD) walk, a measure of functional status, were examined in patients with chronic obstructive pulmonary disease. Four tests were administered at weekly intervals. Performance increased (p < .01) over the first three tests. Test-retest reliability was r34 = .98 (df = 46) for tests 3 and 4. The 12MD walk correlated with the Sickness Impact Profile, Physical Dimension(r = -.45); forced expiratory volume in 1 second % predicted (r =.40); maximal inspiratory pressure (PImax) (r = .52); and exercise-related breathlessness (r = -.49). Exercise-related breathlessness and PImax accounted for 42% of the variance. The validity and reliability of the 12MD walk were supported.