这是2006。估计没有什么戏剧性改变

来源: 于 2018-10-15 11:56:50 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次
this study calculated a ratio of 0.4 (range 0.2- 0.5) for Asians, 0.5 (range 0.3-0.7) for African Americans, 0.5 (range 0.4-0.9) for Hispanics, and 1.1 (range 1.0-1.4) for whites