Hazards ratios of the congenital heart defects by paternal age with maternal age of 27–30 years(n = 590 455).

<p>^aCrude HRs</p><p>^bAdjustment for calendar year of the birth, gender of the child, parity, family history of CHDs, and maternal infection during pregnancy.</p><p>Hazards ratios of the congenital heart defects by paternal age with maternal age of 27–30 years(n = 590 455).