Data on psychomotor development are compiled on 197 achondroplastic children. The data are plotted in a manner similar to that used in the Denver Developmental Screening Test. Gross motor development is delayed in achondroplastic children as compared to children of appropriate age. There is no difference in language development.

These results suggest that tiagabine and gabapentin are effective in the management of chronic pain, with tiagabine having a greater beneficial effect on sleep quality.

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Confidence bands are established for the growth of head circumference in achondroplastic children during their first year of life. the model of (formula see text), where a = (1, t,t2) and t is aged expressed in months provides the best estimated population mean curve with 95% confidence limits.