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Examination of Fatigue Effects from Extended Time Accommodations on the SAT Reasoning Test SAT DIF

Laitusis, Cara Cahalan; Morgan, Deanna L.; Bridgeman, Brent; Zanna, Jennifer; Stone, Elizabeth
Publication Year:
Report Number:
ETS Research Report
Document Type:
Page Count:
Subject/Key Words:
Scholastic Aptitude Test (SAT), Students with Disabilities, Fatigue, Differential Item Functioning (DIF), Assessing People with Disabilities


The sample included students with learning disabilities and/or Attention Deficit/Hyperactivity Disorder (AD/HD) who tested with extended time (time and a half or double time) and students without disabilities who tested under standard-time conditions. Analyses were conducted on the critical reading and writing sections of the SAT and examined item difficulty as well as item completion rates. Results indicated few changes in levels of DIF (early in the test compared to late in the test). In addition, item completion rates for students who received extra time were comparable to (or in some cases higher than) test-takers without disabilities who tested under standard time on both early and late sections.

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