Abstract
In a population-based study cerebral palsy (CP) was diagnosed in 110 cases (2.4 per 1000) among children live born with birth weight > or = 500 g (n = 45,976) during the 20-year-period 1970-89 (CP cases with a postneonatal etiology excluded). The CP-incidence showed a linear trend of decline from 2.8 per 1,000 in the first 5-year-cohort born 1970-74, to 2.0 per 1,000 in children born 1985-89 (p = 0.17). Birth weight specific CP-incidence showed a trend of decline in very low birth weight infants (500-1,499 g) and in infants > or = 2,500 g from the first 10-year-cohort born 1970-79 to the second born 1980-89. The same trend occurred for the incidence of spastic diplegia in total and in children born preterm. These trends of decline did not achieve statistical significance (p > 0.05). The CP-incidence was 36.7 and 11.3 times higher among infants with birth weight 500-1,499 g and 1,500-2,499 g respectively compared to infants > or = 2,500 g (p < 0.01). 15.9% of the decline in CP-incidence from the first to the second 10-year-cohort could be explained by a decreased low birth weight rate (500-2,499 g) in the population, from 4.2% 1970-79 to 3.8% 1980-89 (p < 0.05). The origin of CP was considered prenatal in 22 (20%), perinatal in ...Continue Reading
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