1.   Distantly related members marry and increase the odds of being unknowing carriers of the disorders.

2.   Even now, many Japanese are reluctant to employ a burakumin or allow a family member to marry one.

3.   Its members married earlier than any other group and sought job security provided by large corporations.

4.   Some tribal members married into white families, others into black families.

5.   Tribal members marry only among themselves and are generally suspicious of outsiders.