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SCAN test-retest reliability for first- and third-grade children

N E Amos1, L E Humes

  • 1Indiana University, Bloomington 47405, USA. namos@indiana.edu

Journal of Speech, Language, and Hearing Research : JSLHR
|August 26, 1998
PubMed
Summary

The SCAN screening test for auditory processing disorder showed score improvements in children upon retesting, suggesting potential unreliability. The auditory figure ground subtest was most stable.

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Area of Science:

  • Audiology
  • Neuroscience
  • Developmental Psychology

Background:

  • The Screening test for Auditory Central Processing (SCAN) is a widely used tool for identifying potential central auditory processing disorder (CAPD) in children.
  • Previous test-retest reliability data for SCAN, using a 6-month interval, suggested potential score unreliability.
  • Despite concerns, SCAN has been utilized by both clinicians and researchers in assessing auditory processing in children.

Purpose of the Study:

  • To investigate the test-retest reliability and stability of SCAN outcomes in children using a shorter retest interval.
  • To examine score changes across SCAN subtests (filtered words, auditory figure ground, competing words) and composite scores.
  • To determine the most reliable SCAN measure for clinical decision-making.

Main Methods:

  • The study involved 25 first-grade and 22 third-grade children (ages 6-9) with normal hearing.
  • Participants completed the SCAN test twice with a 6- to 7-week interval, keeping time of day and examiner constant.
  • Analysis of variance (ANOVA) was used to compare scores from the initial test and retest.

Main Results:

  • Significant improvements were observed in raw and standard scores for filtered words (FW), competing words (CW), and the composite (COMP) score from test to retest.
  • The auditory figure ground (AFG) subtest was the only measure showing no significant test-retest difference.
  • Test-retest correlations were moderately strong for CW and COMP scores (0.70 ≤ r ≤ 0.78).

Conclusions:

  • The SCAN test's scores, particularly for FW, CW, and COMP, may improve with repeated administration, indicating potential learning effects or practice.
  • The AFG subtest demonstrated greater stability compared to other SCAN measures.
  • Clinicians are advised to rely solely on the COMP score for recommendations and acknowledge that a second administration might better reflect a child's optimal performance, though norms for second scores are lacking.

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