本研究的目的是利用九十年國民健康體適能成年男性（25歲到49歲）的資料，共25個年齡層，與九個測量指標（收縮壓、舒張壓、安靜心跳率、身高、體重、30秒仰臥起坐、60秒仰臥起坐、坐姿體前彎及心肺耐力指數），以5歲組距為原則，利用階層式集群分析、獨立樣本單因子變異數分析，找尋最佳的年齡分組。研究結果發現，成年男性最佳分組方式第一組為25歲到28歲，第二組為29歲到32歲，第三組為33歲到37歲，第四組為38歲到46歲，第五組為47歲到49歲。

The objective of this study was to use the national health-related fitness data of male adults, the age ranging from 25 to 49 years old, including 9 measurement indexes (systolic pressure, diastolic pressure, static heart rate, height, body weight, 30s sit-ups, 60s sit-ups, sit and reach, and cardiorespiratory) The study used 5 years interval as the group to find the optimal age in dividing the group by utilizing hierarchical clustering analysis, and one-way ANOVA. The results showed that the best way to divide group was by adopting the age ranges of first group, second group, third group, forth group, and fifth group, from 25 to 28 years old, 29 to 32 years old, 33 to 37 years old, 38 to 46 years old, and 47 to 49 years old, respectively.