TABLE 3

Variance in Liability Attributed to Genetic and Shared Environmental Factors

VariableVariancea95% CIaP
IVH41.3%7.0–75.6.02
NEC51.9%33.2–70.6<.001
BPD65.2%52.6–78.9<.001
  • a Variance and 95% CI were computed with SAS PROC NLMIXED using probit models.