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Chronic TBI: (Williams et al, 2006b; n = 103; mean age = 26.7 years; mean time post-TBI 2.7 months; test-retest subsample: n = 20; mean age = 31.0 years, mean time post-TBI = 54.6 months)

• SEM = 1.36 

Chronic TBI: (Williams et al, 2010; n = 20 [test-retest reliability study]; mean age = 31.0 years; mean time post-TBI = 54.6 months)

• SEM for revised eight-item version of HiMAT = 0.79

Chronic TBI: (Williams et al, 2006b)

• MDC95 = increase of 4 points or decrease of 2 points on the total score of the HiMAT 

Chronic TBI: (Williams et al, 2010)

• For the eight-item version the MDC95 was calculated as a deterioration of 1-point or an increase of 2-points

Chronic TBI: (Williams et al, 2006; subset of n = 20, median age = 31 years, median time post injury = 54.6 months)

• Excellent test-retest reliability (ICC = 0.99)

Chronic TBI: (Williams et al, 2010)

• Excellent test-retest reliability for the eight-item version (ICC = 0.99)

Chronic TBI: (Williams et al, 2006; subset of n = 17; median age = 26 years, median time post injury = 20.2 months)

• Excellent Inter-rater Reliability (ICC = 0.99)

Chronic TBI: (Williams et al, 2006b)

• Excellent internal consistency (Cronbach alpha = 0.97) 

Chronic TBI: (Williams et al, 2010) 

• Excellent internal consistency of the eight-item version (Person Separation Index [PSI] = 0.96) 

TBI: (Williams et al, 2006; n = 103; median age = 27.0 years; median time of post-traumatic amnesia = 43.5 days; median time post-injury = 26.7 months)

• Adequate concurrent validity: HiMAT and motor FIM (r = 0.53, p < .001)
• Excellent Concurrent Validity: HiMAT and gross function Rivermead Motor Assessment (r = .87, p < .001)

Chronic TBI: (Williams et al, 2005; Williams et al, 2005b; n = 103; median age = 27 years, median time post-TBI = 801 days; median post-traumatic amnesia time = 43.5 days)

• In the initial development of the HiMAT 28 potential test items were generated from pre-existing mobility scales that assessed high-level mobility and from expert consensus. 
• 28 potential HiMAT test items were then tested for content validity and discriminability, resulting in excluding 17 items and adding 2 items with a total of 13 items in the final version of the HiMAT.

Chronic TBI: (Williams et al, 2006)

• The Gross Function Rivermead Motor Assessment and the Motor FIM were more susceptible to ceiling effects than the HiMAT 

TBI : (Williams et al, 2006; n = 14; median age = 20.0 years; median time of post- traumatic amnesia= 43.5 days; median time postinjury = 3.0 [2.0-5.3] months) 

• The HiMAT was found to be more responsive to change in high-level mobility than the Gross Function Rivermead Motor Assessment or the Motor FIM 
• Mean improvement = 12.1 points (range, 3 to 25 points; max score = 54 points) with 13/14 subject showing change greater than the MDC₉₅ over 3 months. 
• Large effect size of HiMAT in subjects <12 months post-TBI who were retested after 3 months (Responsiveness Indices ranged 1.08-10.34) 

Chronic Acquired Brain Injury : (Williams and Morris, 2009; n = 16; mean age 30.2 (¡À15.4) years; median time post-injury = 25 (¡À7.5) months) 

Healthy 18-25 year olds: (Williams et al, 2009; n = 103; age range = 18-25)

• 50-54 points for males (Median score of 54 points)
• 44-54 points for females (Median score of 51 points)
• Moderate effect size between males and females (r = 0.59)

Healthy 18-25 year olds: (Williams et al, 2009)

• Excellent inter-rater reliability (ICC = 0.88)

Neurologic conditions excluding TBI or congenital conditions: (Williams et al, 2011 n = 95, mean age = 41.3(¡À14.0) years )

• Excellent internal consistency of the eight-item version (PSI = 0.91 and Cronback alpha = 0.95)

Healthy Subjects: (Williams et al, 2009)

• 52.1% of males reached ceiling effect
• 5.5% of females reached ceiling effect