from Section 4 - Clinical aspects
Published online by Cambridge University Press: 01 March 2011
Introduction
After about 32 weeks' gestation, the neurodevelopmental outcome of premature infants appears to be independent of gestation. However, before 32 weeks there is an almost linear relationship between IQ measured later in life and the gestation at which the baby was born. This was shown by a study of the neurodevelopmental outcome of preterm infants by Wolke and colleagues (2001). The authors assessed IQ at 4 years and 8 months. They considered the relationship between medical and social risk factors using data from the Bavarian Longitudinal Study, which had investigated the cognitive and behavioral development of children considered to be vulnerable because of neonatal adversity. Their conclusion was that cognitive and school outcome for infants born before 32 weeks' gestation was better predicted by neonatal risk (by which they meant prematurity and low birthweight) than social factors. The reverse was true for more mature infants. These data fit well with more recent information from very immature infants born before 26 weeks. A UK cohort of very premature babies born in 2000 were included in the Epicure study (see below), which looked at their outcome when they were 6 years old (Marlow et al.,2005). The data from Bavaria and the UK have been combined in Fig. 19.1.
Thus, if birth occurs before about 32 weeks, the more premature an individual is, the greater the degree of disability.
To save this book to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.