The Journal of Pediatrics reports on a study of 1056 two year olds born before 28 weeks gestation.  One hundred twenty of the children could be classified as having cerebral palsy.  The types of CP were as follows: 52% were quadriplegics, 31% were diplegics and 17%  had hemiparesis.  The children with quadriplegia were more likely to be micro-cephalic, have an IQ of less than 70 and  had the highest risk of autism. 

Reference:  Karl C.K. Kuban MD, Elizabeth N. Allred MS, Michael O'Shea MD, MPH, Nigel Paneth MD, MPH, Marcello Pagano PhD, Alan Leviton MD^‡ and ELGAN Study Cerebral Palsy-Algorithm Group (2008) An Algorithm for Identifying and Classifying Cerebral Palsy in Young Children doi:10.1016/j.jpeds.2008.04.013  

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