| Of the 322,704 live singleton births during the study period, 8,938 were linked to a motor vehicle crash during pregnancy. |
| The intrauterine environment is also different in multiple pregnancy compared with singleton pregnancy. |
| Our purpose was to study the effect of hematinic supplementation on the maternal erythropoietin response during singleton pregnancy. |
| Additionally, all singleton, doubleton, and tripleton sites were verified by reamplification and resequencing. |
| The study was restricted to normotensive women with singleton pregnancies who were at 30 weeks' gestation and were employed outside the home. |
| Inclusion criteria were instrumental vertex delivery of a live singleton after 37 weeks of gestation or cesarean delivery at full dilation. |
