Hazards ratios of the five common subtypes of congenital heart defects by paternal age groups.

aCrude hazards ratios
bAdjustment for linear and quadratic terms of maternal age, parental age difference, gender of the child, parity, family history of CHDs, calendar year of childbirth, and maternal infection during pregnancy
cNo cases.
Hazards ratios of the five common subtypes of congenital heart defects by paternal age groups.