Table 6. Population attributable risk percent (PAR %) for the listed outcomes among women age 45 and older compared to women under age 45.[17].
| Population attributable risk percent, PAR%a | |
| Death | 1.32 |
| Mechanical ventilation | 0.09 |
| Transfusion | 0.26 |
| Cardiac Events | |
| Myocardial infarction/ischemia | 2.68 |
| Cardiac arrest/ventricular fibrillation | 1.58 |
| Acute heart failure | 1.06 |
| Pulmonary Events | |
| Pneumonia | 0.21 |
| Pulmonary edema | 0.35 |
| Thromboembolic Events | |
| Pulmonary embolism | 0.62 |
| Deep vein thrombosis | 0.58 |
| Stroke/cerebrovascular disordersb | - |
| Infections | |
| Sepsis | 0.18 |
| Influenza | 0.11 |
| Renal Event | |
| Acute renal failure | 0.88 |
| Obstetric Events | |
| Cesarean delivery | 0.12 |
| Operative vaginal delivery | −0.03 |
| Gestational diabetes | 0.31 |
| Prex, eclamp, gestational hypertension | 0.18 |
| Preterm labor | 0.13 |
| Abruption | 0.17 |
| Fetal growth restriction | 0.10 |
| Fetal demise | 0.27 |
| Cervical incompetence | 0.23 |
| Fetal chromosomal anomaly | 1.39 |
| Macrosomia | 0.01 |
| remature rupture of membranes | 0.06 |
| Placenta previa | 0.81 |
| Postpartum hemorrhage | 0.08 |
| Chorioamnionitis | −0.05 |
a
Population 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.
b
There 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.