The 992 women in the study were enrolled in the california teratogen information service and clinical research program between 1978 and 2005 , which provided confidential risk assessments for any potential toxin exposures during pregnancy .

有992名妇女在1978年到2005年间参加了加州致畸信息服务和临床研究规划的一项研究，它提供了怀孕期间暴露于任何潜在毒素下可能产生的个人风险估算。