Ascertainment bias may overestimate NDI in extremely low-birth-weight or extremely low-gestational-age survivors at 18 to 24 months. Alternatively, the characteristics of different populations and health systems may contribute to higher rates of attrition and higher rates of NDI.
Archives of pediatrics & adolescent medicine
Division of Neonatology, The Children's Hospital of Philadelphia, PA 19104, USA.
Arch Pediatr Adolesc Med. 2012 Feb;166(2):178-84
© Galenicom 1999-2013