It shows good construct validity, indicated by symmetrical and homogeneous variability from 3 months upwards, and reasonable results in describing gender differences in development by age, the mean score increasing with socio-economic conditions and diminishing among low-birthweight children. The score corresponds with maternal opinion of child developmental status and with the 3-category scale of the DDST. This method estimates development status using both difficulty and discriminating power of each item in the reference population, an advantage over scores based on total number of items correctly performed or failed, which depend on difficulty only. The score of developmental status is the natural logarithm of this ability age divided by chronological age and thus measures the delay or advance in the child’s ability age compared with chronological age. Each child’s ability age was then estimated by maximum likelihood as the age in this reference population corresponding to the child’s success and failures in the test. The items of success were standardised by logistic regression on log chronological age. The DDST was applied in a community-based survey of 3389 under-5-year-olds in Porto Alegre, Brazil. It was devised using the Denver Developmental Screening Test (DDST) but can be used for Denver II.
A method for translating research data from the Denver Test into individual scores of developmental status measured in a continuous scale is presented.
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