If you look in the normal population and ask what fraction of people have [a defect in methylation in the gene encoding insulin-like growth factor 2] it's about 5 percent.

如果你观察普通人群，调查多少比例的人有[胰岛素类生长因子2基因编码甲基化的缺陷]，大概是百分之5。

youdao

Langton said the airline has a "fiddle factor" of about 2%.

CNN: Pay-as-you-weigh airfares the 'next step'