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September 1985

The Motor Quotient: A Method for the Early Detection of Motor Delay

Author Affiliations

From the Department of Pediatrics, The Johns Hopkins University School of Medicine, and The John F. Kennedy Institute for Handicapped Children, Baltimore.

Am J Dis Child. 1985;139(9):940-942. doi:10.1001/archpedi.1985.02140110094038

• A motor quotient was calculated by dividing the age of a child's best motor achievement by his or her chronologic age. A quotient less than 50 was said to predict gross motor delay (walking at or later than 24 months). Applying the quotient to 144 8- to 18-month-old children yielded a sensitivity of 87%, specificity of 89%, and overreferral and underreferral rates of 12%. By viewing motor development as a ratio, one is able to forecast motor delay.

(AJDC 1985;139:940-942)