A comparison of the Stanford Binet Intelligence Scale-Fifth Edition and the Wechsler Nonverbal Scale of ability in children with autism and significantly impaired adaptive functioning

Authors

  • Chantanee Mungkhetklang Rajanukul Institute
  • Sucharat Limpanopparat Rajanukul Institute

Keywords:

Autism, adaptive functioning, Stanford Binet Intelligence Scale-Fifth Edition (SB5), Wechsler Nonverbal Scale of Ability (WNV)

Abstract

Objectives To examine the difference between the Stanford Binet Intelligence Scale-Fifth Edition (SB5) (only Nonverbal Domain) and the Wechsler Nonverbal Scale of Ability (WNV) in children with Low Functioning Autism (LFA). Despite the nonverbal feature of both assessments, there are dissimilarities which could lead to the efficacy in real-world practice.

Materials and Methods Thirty-seven children with autism from Autistic ward 1, 2 and 3 at Rajanukul Institute aged above 3 years, who have Adaptive Behavior Composite score from Vineland Adaptive Behavior Scales below than 30, were assigned. The participants were asked to do all subtests of the WNV and nonverbal domain in the SB5. The IQ scores from both tests non-normally distributed were analyzed using the Wilcoxon signed-rank test.

Results The results revealed that the IQ scores from the SB5 ( = 51.05, SD = 12.07) were significantly higher (Z = -2.483, p= 0.013) than IQ scores from the WNV ( =47.16, SD = 12.23). Furthermore, the subtest materials in the SB5 are more convincing for LFA which mostly using hand to do trial and error rather than just pointing for the WNV.

Conclusion Though the WNV and the SB5 are reliable instruments, the SB5 may be a greater choice for pulling out the potential of the children with LFA which are usually underestimated due to their limited language skills. Our results expected to raise awareness and enlighten practitioners about the differences in various cognitive tests which would help to enhance the effectiveness of intelligence assessment on those individuals.

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Published

2023-03-21

How to Cite

1.
Mungkhetklang C, Limpanopparat S. A comparison of the Stanford Binet Intelligence Scale-Fifth Edition and the Wechsler Nonverbal Scale of ability in children with autism and significantly impaired adaptive functioning. ว. ราชานุกูล [internet]. 2023 Mar. 21 [cited 2026 Jan. 4];34(2). available from: https://he03.tci-thaijo.org/index.php/RJJ/article/view/447

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Original article