On the basis of coal practice, grey system theory is used and classified index system is set up.

根据煤矿生产实际，应用灰色系统理论建立了井下劳动环境聚类指标体系。

The indexes include overall index, classified index, item index and a number of sub-item indexes.

综合评价指标体系包括总体指标、分类指标、分项指标以及若干个子项指标。

But for obese people, classified as those having a body mass index (BMI) of 30 or above, the risk soared.

对于体重指数在30以上的过度肥胖人群其患病风险还要高得多。

Methods According to body mass index(BMI) and waist to hip circumference(W/H), the subjects were classified into three groups: intra abdominal obesity, subcutaneous obesity and non obesity group.

方法采用人体测量参数体重指数（ BMI）和腰臀围比值（ W/H）将体脂分布不同分为腹内型肥胖组、皮下肥胖组及非肥胖组。

The damage diagnosis method based on vibration testing can be further classified as a direct system identification method, a damage index method and a finite element model modification method.

其中基于振动测试的损伤诊断法可进一步分为直接的系统识别方法、损伤指标法和有限元模型修正法。