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

<p>^aCrude hazards ratios</p><p>^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</p><p>^cNo cases.</p><p>Hazards ratios of the five common subtypes of congenital heart defects by paternal age groups.