Combining Nonword and Sentence Repetition to Identify Developmental Language Disorder

Area of Science:

• Linguistics
• Developmental Psychology
• Clinical Linguistics

Background:

• Nonword repetition and sentence repetition are established tools for identifying developmental language disorder (DLD).
• Previous research indicates variable diagnostic accuracy across different age groups, measures, and languages.
• The combined diagnostic utility of these repetition tasks for DLD remains understudied.

Purpose of the Study:

• To compare the diagnostic accuracy of nonword repetition and sentence repetition individually versus in combination for DLD identification.
• To evaluate the utility of combined repetition tasks in identifying DLD in young children.

Main Methods:

• 196 monolingual Vietnamese children aged 4-6 were assessed, including 168 with typical development (TD) and 28 with DLD.
• Logistic regression and ROC curves were employed to determine cutpoints and diagnostic accuracy.
• Diagnostic accuracy was calculated for each task separately and for the combined tasks.

Main Results:

• Individual tasks showed adequate sensitivity but insufficient specificity for DLD identification (NWR: 89.3% sensitivity, 41.1% specificity; SR: 82.1% sensitivity, 76.2% specificity).
• The combination of nonword and sentence repetition demonstrated adequate sensitivity (85.7%) and specificity (81.6%).
• The combined approach yielded informative likelihood ratios (positive: 4.65, negative: 0.18).

Conclusions:

• Combining nonword and sentence repetition tasks enhances the accurate identification of DLD in 4- to 6-year-old Vietnamese children.
• These tasks may capture different underlying linguistic weaknesses contributing to DLD.
• Further validation and automation of the combined model are recommended for clinical practice.