Concurrent Validity of the Early Intervention Developmental Profile and the Peabody Developmental Motor Scale-2Maring, Joyce R. PT, EdD; Elbaum, Leonard PT, EdDPediatric Physical Therapy: Summer 2007 - Volume 19 - Issue 2 - pp 116-120 doi: 10.1097/PEP.0b013e31804a5786 Research Report Abstract In Brief Author Information Purpose: The purpose of this study was to determine the concurrent validity of the Early Intervention Developmental Profile (EIDP) and the Peabody Developmental Motor Scale-2 (PDMS-2) in examining gross motor delay. Methods: Thirty children with a variety of developmental delays attending an early intervention program were administered both the PDMS-2 and the EIDP as part of their developmental evaluations. Results: The PDMS-2 and EIDP were strongly correlated (r = 0.91, p < 0.01) but the mean age equivalent scores were significantly different. Age equivalent scores were on average 26% higher on the EIDP. Conclusions: Differences in age equivalent scores between tests may affect a child’s eligibility for services in some states. This study supports the use of norm-based tests when determining a percentage of delay relative to the norm. Developmental tests should not be the sole determinant of the clinical decision making processes. The authors report the age equivalent scores were on average 26% higher on the EIDP than on the PDMS-2 suggesting that determination for early intervention services could vary widely depending on the test instrument employed. Program in Physical Therapy (J.R.M.), George Washington University, Washington, DC and School of Health, Florida International University (L.E.), Miami, Florida Address correspondence to: Joyce Maring, EdD, PT, Program in Physical Therapy, George Washington University, 900 23rd Street, NW, 6th Floor, Washington, DC 20037. Email: firstname.lastname@example.org. © 2007 Lippincott Williams & Wilkins, Inc.