There is a lack of concurrent validity between the PDMS-2 standard scores and standard scores of the BSID-II Motor Scale and a lack of agreement between age equivalent scores of the BSID-II Motor Scale and the PDMS-2 subtests except for Locomotion. The investigators caution about using only one standard score or age equivalent score for decisions about the need for early intervention for children at 12 months of age when using the BSID-II or the PDMS-2.
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