Growth in North American white children with neurofibromatosis 1 (NF1)

Objective-To analyse the distributions of and generate growth charts for st ature and occipitofrontal circumference (OFC) in neurofibromatosis I (NF1) patients. Design-Cross sectional database survey. Setting-The National Neurofibromatosis Foundation International Database (N FDE) includes clinical information on NF1 patients fi om 14 participating c entres in North America. Subjects-A total of 569 white, North American, NF1 patients, 55% female and 45% male. Main outcome measures-Stature and OFC measurements of NF1 patients were com pared to age and sex matched population norms using z score standardisation and centile curves. Results-The distributions of stature and OFC are shifted and unimodal among NF1 patients; 13% of patients have short stature (greater than or equal to 2 standard deviations below the population mean) and 24% have macrocephaly (OFC greater than or equal to2 standard deviations above the population mea n). Conclusions-Alterations of stature and OFC are not limited to NF1 patients with frank short stature or macrocephaly.