Predictive validity of the New Zealand MacArthur Communicative Development Inventory: Words and Sentences.

Area of Science:

• Child language development
• Psycholinguistics
• Developmental psychology

Background:

• The MacArthur Communicative Development Inventories: Words and Sentences (CDI:WS) is a widely used tool for assessing early language skills.
• Understanding the long-term predictive validity of such tools is crucial for accurate language development assessment.

Purpose of the Study:

• To evaluate the long-term predictive validity of the New Zealand version of the CDI:WS for children's expressive and receptive vocabulary.
• To examine the CDI:WS's reliability and predictive power over an extended period.

Main Methods:

• Sixty-one New Zealand children were assessed using the NZ CDI:WS at 19 and 25 months.
• Children also completed the Expressive Vocabulary Test and Peabody Picture Vocabulary Test-III at 32 and 40 months.
• Statistical analyses were performed to determine reliability and predictive validity.

Main Results:

• The NZ CDI:WS demonstrated excellent reliability and good long-term predictive validity, even over a 21-month period.
• Predictive validity for receptive vocabulary (PPVT-III) was stronger in children of mothers with lower educational attainment.
• The findings support the use of the CDI:WS across diverse cultural and educational contexts.

Conclusions:

• The NZ CDI:WS is a reliable and valid measure for assessing early vocabulary development in young children.
• The tool's predictive utility is robust over time and potentially influenced by maternal education.
• Results support the CDI:WS's applicability for diverse populations in language development research and clinical practice.