From January to May of 1985 the authors of this article investigated, by random sampling, 649 cases of epicanthus and epibole(312 cases for male, 334 for female)among the Mongolians from all parts of Nei Mongol Autonomous Region.

• 作者于1985年1月至5月调查了内蒙古自治区蒙古族人649例(男315例,女334例)蒙古褶,上眼睑褶皱。