下か位い群ぐん

Meanings

1

A group that is part of a larger group, often used in classification, statistics, or organizational contexts.

この研けん究きゅうでは、参さん加か者しゃを年ねん齢れいで三みっつの下か位い群ぐんに分わけた。
In this study, the participants were divided into three subgroups by age.