Most of them come from the provinces of Kwangtung, Fukien, Hunan and Yunan, which are geographically closest to Taiwan, and more than two thirds are 12 to 16 years of age.
其中又以地理上接近台灣的廣東、福建、湖南、雲南等省籍的較多；年齡多在十二到十六歲間，佔總人數三分之二以上。