Median Range
Age, mo 20.00 2-69
Period of gestation, w 38.00 23-42
Birth weight, g 2892.00 476-4170
gender 169 boys 148 girls
diagnosis number  
cerebral palsy 9  
spinal bifida 10  
hypoxic encephalopathy 3  
chromosomal abnormality 4  
motor retardation 28  
mental retardation 6  
delayed language 5  
developmental disorders 26  
hearing disorder 4  
hydrocephalus 7  
Chiari malformation 6  
encephalitis 4  
osteogenesis imperfecta 2  
epilepsy 2  
small for gestational age 15  
craniosynostosis 3  
hypothyroidism 4  
metabolic disorders 6  
other conditions 22  
apparently healthy children 151  
Table 1: Profile of study participants.