Detecting language problems: accuracy of five language screening instruments in preschool children

Area of Science:

• Pediatric Language Development
• Developmental Psychology
• Early Childhood Education

Background:

• Early identification of language delays is crucial for timely intervention.
• Numerous screening instruments exist, but their effectiveness in diverse populations requires validation.
• Parental input is a valuable component in assessing child development.

Purpose of the Study:

• To evaluate the reliability, validity, and accuracy of five screening instruments for identifying language delays in 3-year-old children.
• To determine which simple screening tools perform best in a large-scale population study.
• To compare parent-report measures with specialist assessments.

Main Methods:

• A large-scale postal survey of 8877 children aged 3 years was conducted.
• Five screening instruments were administered: General Language Screen (GLS), Van Wiechen (VW) items, Language Screening Instrument-Parent Form (LSI-PF), Language Screening Instrument-Child Test (LSI-CT), and a Visual Analogue Scale (VAS).
• Reliability, concurrent validity, and accuracy (sensitivity, specificity, ROC curves) were assessed against reference standards.

Main Results:

• All instruments demonstrated acceptable reliability (alpha=0.67-0.72) and good concurrent validity (r=0.29-0.55).
• Short parent-report instruments, specifically the LSI-PF and the one-item VAS, showed high sensitivity (50-86%) in detecting language delays.
• The Language Screening Instrument-Child Test (LSI-CT) exhibited the lowest sensitivity (43-62%).

Conclusions:

• Short, simple parent-report screening tools, such as the LSI-PF and VAS, are effective for identifying potential language delays in preschool children.
• These instruments offer a practical and efficient method for initial screening in large populations.
• Further investigation into the optimal cut-off points for these tools may enhance their clinical utility.