association between mothers and daughters in the timing of a first pregnancy ending in a live birth," say Dr. Joel Ray and Ms. Ning Liu, the Institute for Clinical Evaluative Sciences, Toronto, Ontario. "We wanted to see whether the same tendency exists for pregnancies ending in an induced abortion."We don't know what factors cause this association, as it was beyond the scope of our study," says Ning Liu. "Previous studies have found a higher likelihood of teen abortion if a young woman has greater social challenges, including poor school performance, separation from a biological parent, lower