TABLE 2.

Prevalence of CP in Infant Survivors by Birth Weight and Race: A Comparison Between 1975–1977, 1981–1985, and 1986–1991

Birth Weight (Grams)RaceBirth CohortCochran-Armitage Trend Test P Value §
1975–19771981–19851986–1991Infant Survivor-Based Prevalence RatesLive Birth Based-Prevalence Rates
Number of Children With CP*CP Prevalence Rate (per 1000 Infant Survivors)CP Prevalence Rate (per 1000 Live Births)Number of Children With CPCP Prevalence Rate (per 1000 Infant Survivors)CP Prevalence Rate (per 1000 Live Births)Number of Children With CPCP Prevalence Rate (per 1000 Infant Survivors)CP Prevalence Rate (per 1000 Live Births)
<1500White1070.430.03974.745.75363.842.0.280.241
Black1760.927.94550.232.09158.239.2.416.062
1500–2499White16−7.77.1368.88.5458.07.8.486.419
Black146.25.8346.96.7425.25.1.201.236
>2500White340.90.9550.750.751211.01.0.078.076
Black190.90.9511.11.1891.21.2.187.180
TotalWhite601.51.41301.51.52191.71.7.070.064
Black502.22.11302.52.52222.62.6.145.124
  • * CP cases identified at 10 years of age.

  • Includes only children with recorded birth weight and race

  • CP cases identified at 3 to 10 years of age.

  • § P value presented is an asymptotic P value for a 1-sided test.

  • Prevalence rate ratios indicated a significant difference between white and black children.

  • Totals do not add to those in Table 1 because of the non-white, non-black children excluded from this analysis.