A database review conducted by Dimitrios Mastrogiannis, associate professor of obstetrics, gynecology and reproductive sciences at Temple's School of Medicine, indicates that the vaginal delivery rate among U.S. pregnant women under age 16 is significantly higher than among older pregnant women, despite a greater risk for obstetrical complications. "What we can't determine from this dataset is how children who are having children respond psychologically to their pregnancies and young motherhood," Mastrogiannis said.