Volume 133, Issue 5, Pages (May 2008)

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Volume 133, Issue 5, Pages 1155-1160 (May 2008) Modifying Track Layout From Straight to Circular Has a Modest Effect on the 6-min Walk Distance Bansal Vishal , MD, PhD, Hill Kylie , PhD, Dolmage Thomas E. , MSc, Brooks Dina , PhD, Woon Lynda J. , BSc, Goldstein Roger S. , MD, FCCP CHEST Volume 133, Issue 5, Pages 1155-1160 (May 2008) DOI: 10.1378/chest.07-2823 Copyright © 2008 The American College of Chest Physicians Terms and Conditions

Figure 1 Study design. CHEST 2008 133, 1155-1160DOI: (10.1378/chest.07-2823) Copyright © 2008 The American College of Chest Physicians Terms and Conditions

Figure 2 Bland-Altman plot showing agreement between 6MWD measured during the final test session on straight and circular tracks. The solid line indicates the mean difference in 6MWD measured on straight and circular tracks. The dashed lines indicate the upper and lower limits of agreement (twice the SD of the difference in 6MWD measured on straight and circular tracks). CHEST 2008 133, 1155-1160DOI: (10.1378/chest.07-2823) Copyright © 2008 The American College of Chest Physicians Terms and Conditions

Figure 3 Bland-Altman plots showing the coefficient of repeatability for the 6MWD measured on different days on the straight track (left, a) and coefficient of repeatability for the 6MWD measured on different days on the circular track (right, b). The solid lines indicate the mean difference in 6MWD measured on the 2 days. The dashed lines indicate the upper and lower limits of the coefficient (twice the SD of the difference in 6MWD measured on the 2 days). CHEST 2008 133, 1155-1160DOI: (10.1378/chest.07-2823) Copyright © 2008 The American College of Chest Physicians Terms and Conditions