Evans J R, Selstad G, Welcher W H
Fam Plann Perspect. 1976 Jul-Aug;8(4):192-200.
Following abortion or delivery, teenagers' knowledge and use of effective contraception improved markedly; but those who had negative pregnancy tests continued to take risks--and to get pregnant--subsequently. Most sexually active teenagers were poorly educated on the facts of reproduction, and began to have intercourse before seeking contraception.
流产或分娩后，青少年对有效避孕措施的了解和使用显著改善；但那些妊娠试验呈阴性的青少年随后仍继续冒险——并再次怀孕。大多数有性行为的青少年对生殖知识了解甚少，在寻求避孕措施之前就开始发生性行为。
