Six-Minute Walk Test in Patients With Down Syndrome: Validity and Reproducibility  Jeroen C. Vis, MD, Hanneke Thoonsen, MD, Marielle G. Duffels, MD, Rianne A. de Bruin-Bon, Sylvia A. Huisman, MD, Arie P. van Dijk, MD, PhD, Elke S. Hoendermis, MD, PhD, Rolf M. Berger, MD, PhD, Berto J. Bouma, MD, PhD, Barbara J. Mulder, MD, PhD  Archives of Physical Medicine and Rehabilitation  Volume 90, Issue 8, Pages 1423-1427 (August 2009) DOI: 10.1016/j.apmr.2009.02.015 Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 1 Distance walked by the group with severe cardiac disease and the group with no or mild cardiac disease for all patients and for 2 subgroups divided by level of intellectual disability. Representations are median and centiles. Archives of Physical Medicine and Rehabilitation 2009 90, 1423-1427DOI: (10.1016/j.apmr.2009.02.015) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 2 Bland and Altman plot for data from the two 6MWTs. The difference between the first and second 6MWD plotted against the subject's mean of the two 6MWTs. The center dashed line equals the mean difference between the 2 tests and outer dashed lines equal ±2 SD of the mean. Archives of Physical Medicine and Rehabilitation 2009 90, 1423-1427DOI: (10.1016/j.apmr.2009.02.015) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions