Objective
To compare the relationship of the Bayley Scales of Infant and Toddler Development 3rd Edition (K-BSID-III) language score and the Sequenced Language Scale for Infant (SELSI) score and evaluate the sensitivity and specificity of K-BSID-III language score and optimal cutoff value with receiver operator characteristic (ROC) curve analysis in infants and toddlers with delayed language development.
Methods
A total of 104 children with suspected language developmental delay were included in this retrospective study. Subjects were tested using the K-BSID-III and SELSI and subdivided into several groups according to the severity of language scores. ROC curve analysis was performed to assess K-BSID-III for delayed language development.
Results
Receptive and expressive language subscales of the K-BSID-III showed markedly significant correlation with the SELSI scores (p<0.001). ROC analysis showed an area under the curve of 0.877 (p<0.001) in SELSI receptive score and 0.935 (p<0.001) in SELSI expressive score. The optimal cutoff value where sensitivity of 85% and specificity of 81% were achieved with the K-BSID-III receptive score was 1.50 (between average and low average) in the SELSI receptive score. The optimal cutoff value where sensitivity of 96% and specificity of 82% were achieved with the K-BSID-III expressive score was also 1.50 in the SELSI expressive score.
Conclusion
In this study, the correlations between K-BSID-III and SELSI language scores were statistically significant. However, the interpretation should be considered carefully in low average group due to tendency of underestimation of delayed language development.

Citations

• Longitudinal Analysis of Developmental Trajectories in Children With Language Delay
  Ji Hyun Park, Hoa Ngan Doan, Min Cheol Chang
  Clinical Pediatrics.2026; 65(8): 1015.     CrossRef
• Gestational Age and Neurodevelopmental Outcomes in Preterm Children at Early Preschool Age: A Longitudinal Multidomain Logistic Modeling Study
  Ji Na Yang, Ye Kyeng Seo, Dong Hyun Kim, Nam Hun Heo, Soo A Kim, Jun Hwan Song, Seung Soo Kim
  Annals of Child Neurology.2026; 34(2): 109.     CrossRef
• Feasibility of NIV-NAVA as a primary respiratory support and its clinical impacts in a targeted group of preterm infants: protocol for a prospective observational study
  Hannah Cho, Young Hwa Jung, Jiseon Park, Hyo Ju Yang, Mi Jin Kim, Juyoung Lee
  BMJ Open.2026; 16(6): e114353.     CrossRef
• Language Outcomes in Moderate-to-Late Preterm Infants at 2 Years of Corrected Age
  Sung Hee Lee, Ju Hyun Jin, Shin Won Yoon
  Neonatal Medicine.2026; 33(1): 66.     CrossRef
• Comparative analysis of the effects of early breastfeeding versus formula feeding on the growthand development of preterm infants
  Paygozar Rasool
  Journal of the Selva Andina Research Society.2025; 16(2): 128.     CrossRef
• Analysis of the impact of parents' electronic screen time habits, young children's screen exposure and parent-child interaction on language development delay in young children
  Xiaohong Wan, Xiaoqing Kang, Shunli Chen, Juan Du, Fang Yan, Yongqi Bai
  Frontiers in Pediatrics.2025;[Epub]     CrossRef
• Short-term and long-term effects of skin-to-skin contact in healthy term infants: study protocol for a parallel-group double-blind randomised controlled trial
  Hannah Cho, Jiseon Park, Seung-Ah Choe, Juyoung Lee
  BMJ Open.2025; 15(10): e104809.     CrossRef
• Effects and Predictors of Two-Person Small Group Speech Therapy in Children With Language Disorder: A Retrospective Observational Study
  Chang Hee Lee, Jecheon Seong, Yun Jung Lee, Jeonghun Kim, Aram Kim
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• Neonatal outcomes of early preterm births according to the delivery indications
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• The effect of dexmedetomidine on neuroprotection in pediatric cardiac surgery patients: study protocol for a prospective randomized controlled trial
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Objective: To investigate the relationship of language, intelligent and social quotients in children with speech and language disorder and to evaluate the clinical usefulness of language quotient for predicting the extents of cognitive and social functions.

Method: Total 139 children who visited the department of rehabilitation medicine for the evaluation of suspected speech-language delay. All children were evaluated for receptive and expressive language quotients, articulation accuracy, verbal, performance and full-scale intelligent quotients and social maturation assessment.

Results: Approximately 70% of the children who had chief complaints of speech or language disorder were diagnosed as 'receptive and expressive language developmental delay'. Intelligent and social quotients of the children with receptive and expressive language developmental delay were significantly lower than those of the other groups (p＜0.05). Both receptive and expressive language quotients, but not dysarticulation, were significantly correlated with intelligent and social quotients (p＜0.05). Multiple regression analysis demonstrated that the language quotients could predict intelligent and social quotients as simple equations (p＜0.01).

Conclusion: Primary result of receptive and expressive language quotients from screening test of language evaluation might be able to predict cognitive function and social maturity, which also showed high-degree positive correlation with intelligent and social quotients. This result could provide a useful guideline for further developmental studies in children with speech and language disorder who received primary speech evaluation. (J Korean Acad Rehab Med 2008; 32: 129-134)