Linear growth velocity in children with cerebral palsy

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Abstract
Retrospective analysis of an anthropometric database collected prospectively in children with cerebral palsy (CP) was carried out to evaluate linear growth velocity and identify risk factors for poor linear growth. Growth velocity measures were compared with published norms for prepubertal growth velocity and z scores were calculated. Mean growth velocity z score (Gvz) was -0.97+/-1.9. Boys grew more slowly than girls (mean Gvz = -1.5+/-1.9 versus -0.3+/-1.7 P = 0.003). Gvz did not correlate with type of CP or presence/absence of microcephaly. Young age was a risk factor for poor linear growth (mean Gvz = -2.40+/-2.6 for children under 2 years of age versus -0.76+/-1.9 ages 2 to 6 and -0.77+/-1.6 ages 6 to 10, P = 0.04). Children at nutritional risk (triceps skinfold thickness < or =55%) grew poorly (mean Gvz = -1.46+/-1.5 versus -0.30+/-1.8, P = 0.01). For children over 2 years, those with cognitive impairments grew more slowly than those with normal cognition (mean Gvz = -1.25+/-1.9 versus -0.12+/-1.8, P = 0.02) and non-ambulatory children grew more slowly than ambulatory children (mean Gvz = -1.20+/-1.5 versus -0.35+/-1.9, P = 0.03). Prepubertal children with CP grow more slowly than expected compared with age- and sex-based standards. Sex, age, cognitive impairment, ambulatory status, and nutritional state are factors which may contribute to slow growth. These results add to the growing data that children with CP have unique growth patterns. Further study is needed to clarify the factors which contribute to poor linear growth in this population.

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