Journal of Autism and Developmental Disorders

, Volume 38, Issue 9, pp 1751–1757 | Cite as

Characterization of Potential Outcome Measures for Future Clinical Trials in Fragile X Syndrome

  • Elizabeth Berry-KravisEmail author
  • Allison Sumis
  • Ok-Kyung Kim
  • Rebecca Lara
  • Joanne Wuu
Original Paper


Clinical trials targeting recently elucidated synaptic defects in fragile X syndrome (FXS) will require outcome measures capable of assessing short-term changes in cognitive functioning. Potentially useful measures for FXS were evaluated here in a test–retest setting in males and females with FXS (N = 46). Good reproducibility, determined by an interclass correlation (ICC) or weighted kappa (κ) of 0.7–0.9 was seen for RBANS List and Story Memory, NEPSY Tower, Woodcock–Johnson Spatial Relations and the commissions score from the Carolina Fragile X Project Continuous Performance Test (CPT). This study demonstrates the feasibility of generating test profiles containing reliability data, ability levels required for test performance, and refusal rates to assist with choice of outcome measures in FXS and other cohorts with cognitive disability.


Fragile X syndrome Clinical trials Outcome measures FMR1 



This study was supported by a grant from the Spastic Paralysis Research Foundation of the Illinois-Eastern Iowa District of Kiwanis International. The authors would like to thank Steve Hooper PhD for providing the Carolina Fragile X Project CPT, Mina Johnson PhD for providing the Card Task, and Isabel Boutet PhD for assisting with training of study staff for use of the NVALT. The authors especially thank the fragile X families who participated in this trial for their time and enthusiasm.


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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Elizabeth Berry-Kravis
    • 1
    • 2
    • 3
    Email author
  • Allison Sumis
    • 1
    • 4
  • Ok-Kyung Kim
    • 5
  • Rebecca Lara
    • 1
    • 6
  • Joanne Wuu
    • 2
    • 7
  1. 1.Department of PediatricsRush University Medical CenterChicagoUSA
  2. 2.Department of Neurological SciencesRush University Medical CenterChicagoUSA
  3. 3.Department of BiochemistryRush University Medical CenterChicagoUSA
  4. 4.Department of Molecular and Cellular OncologyGeorgetownUSA
  5. 5.Rush University School of MedicineChicagoUSA
  6. 6.Pritzer School of MedicineChicago UniversityChicagoUSA
  7. 7.Department of NeurologyEmory UniversityAtlantaUSA

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