Polish Vocabulary Development in 2-Year-Olds: Comparisons With English Using the Language Development Survey

Purpose

The objective of this study was to compare vocabulary size and composition in 2-year-olds learning Polish or English as measured by the Language Development Survey (LDS; Rescorla, 1989).

Method

Participants were 199 Polish toddlers (M = 24.14 months, SD = 0.35) and 422 U.S. toddlers (M = 24.69 months, SD = 0.78).

Results

Test–retest reliability was .92, internal consistency was .99, and concurrent validity was .55. Girls had higher vocabulary scores than boys. Mean LDS score was significantly lower in Polish than in English, and fewer Polish children had LDS scores >200 words. Also, more words were reported for Conclusions

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