Population attributable risk percent (PAR %) for the listed outcomes among women age 45 and older compared to women under age 45.[17].

aPopulation attributable risk percent was calculated using the equation: PAR = Pe (RRe–1)/[1+ Pe (RRe–1)], where PAR = Population attributable risk, Pe = prevalence of the exposure, and RRe = relative risk of disease due to the exposure.[17] The exposure group is pregnant women 45 and over and the comparison group is all pregnant women at delivery age less than 45.bThere were less than 10 subjects with stroke/cerebrovascular disorders among women age 45 and older. The NIS does not allow the reporting of the number of subjects of any cell with 10 or less subjects, thus a PAR% value was not calculated.Pregnancies to women aged 45 and older represented 0.19% of all deliveries in the years 2008–2010.