WHAT'S KNOWN ON THIS SUBJECT: The incidence of cerebral palsy is dependent on the gestational age in very preterm infants and risk factors have been identified for term infants. The risk has also proved to be greater among late preterm births compared with term.
WHAT THIS STUDY ADDS:The incidence of cerebral palsy was 24-fold in moderately preterm and 6-fold in late preterm infants compared with full-term infants. The most prominent risk factors included asphyxia and intracranial hemorrhage. The incidence diminished over time and with increasing gestational age. (,32 +0 weeks) and term infants ($37 weeks).
METHODS:The national register study included all live-born infants in Finland from 1991 to 2008. Infants who died before the age of 1 year, had any major congenital anomaly, or had missing data were excluded. A total of 1 018 302 infants were included in the analysis and they were analyzed in 4 subgroups (VP, MP, LP, and term) and 3 time periods (1991-1995, 1996-2001, and 2002-2008).RESULTS: By the age of 7 years, 2242 children with CP were diagnosed (0.2%). CP incidence was 8.7% in the VP, 2.4% in the MP, 0.6% in the LP, and 0.1% in the term group. Dr Hirvonen drafted the initial manuscript and participated in the analytic planning; Drs Ojala, Korhonen, Haataja, Eriksson, and Gissler participated in the analytic planning and critically reviewed and revised the manuscript; Ms Luukkaala conducted the statistical analyses and critically reviewed and revised the manuscript; Dr Tammela designed and supervised the study and critically reviewed and revised the manuscript; and all authors approved the final manuscript as submitted.www.pediatrics.org/cgi