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Brief Assessment of Motor Function: Reliability and Concurrent Validity of the Gross Motor Scale

Cintas, Holly L. PhD; Siegel, Karen Lohmann PT, MA; Furst, Gloria P. OTR/L, MPh; Gerber, Lynn H. MD

American Journal of Physical Medicine & Rehabilitation: January 2003 - Volume 82 - Issue 1 - p 33-41
Research Article: Assessment

Cintas HL, Siegel KL, Furst GP, Gerber LH: Brief Assessment of Motor Function: Reliability and concurrent validity of the Gross Motor Scale. Am J Phys Med Rehabil 2003;82:33–41.

Objective The Brief Assessment of Motor Function (BAMF) is a series of 10-point ordinal scales developed for rapid description of gross motor, fine motor, and oral motor performance. We examined interrater and intrarater reliability and concurrent validity of the BAMF Gross Motor Scale.

Design This validation study included 48 children (age, 5 mo to 17 yr) with a wide range of gross motor capability. Ten children with varied diagnoses participated in the reliability study. For concurrent validity, the BAMF performance of 38 children with osteogenesis imperfecta was compared with scores on the Peabody Developmental Motor Scales, laboratory gait analysis, and manual muscle testing.

Results Reliability values for intraclass correlations were 0.996 (interrater) and 1.00 (intrarater). Significant relationships were identified between the BAMF and gait speed (r = 0.68, P < 0.0001), stride length (r = 0.71, P < 0.0001), duration of double-limb support (r = −0.40, P < 0.03), number of weak muscles (r = −0.74, P < 0.0001), and the Peabody Developmental Motor Scales (r = 0.95, P < 0.0001). Number of weak muscles was the strongest predictor of BAMF score (R 2 = 0.5080, F = 24.77, P < 0.0001).

Conclusions The BAMF demonstrates good reliability for children with a range of diagnoses and acceptable concurrent validity with gross motor development, muscle strength, and formal gait assessment in children with osteogenesis imperfecta.

From the Rehabilitation Medicine Department, Warren G. Magnuson Clinical Center, National Institutes of Health, Bethesda, Maryland.

Opinions presented in this article reflect the views of the authors and not necessarily those of the National Institutes of Health or the United States Public Health Service. Because we are United States federal employees, this article fits the description of a “United States Government Work” and cannot be copyrighted (Copyright Revision Act, 1976). It is available for publication, and there are no restrictions on its use, now or subsequently.

Presented as a platform presentation at the American Academy of Cerebral Palsy and Developmental Medicine Annual Meeting, Toronto, Ontario, Canada, September 21, 2000.

All correspondence and requests for reprints should be addressed to Holly L. Cintas, PhD, Physical Therapy Rehabilitation Medicine Department, National Institutes of Health, Building 10, Room 6 South 235, Bethesda, MD 20892-1604.

© 2003 Lippincott Williams & Wilkins, Inc.