Table 3.

Optimal cut-off values of BF% and their sensitivities, specificities and Youden's index for CVD risk factors by age groups and sex

	Hypertension				Diabetes				Dyslipidemia				Risk factors ≥2
	Cut-off	Sen	Spe	YI	Cut-off	Sen	Spe	YI	Cut-off	Sen	Spe	YI	Cut-off	Sen	Spe	YI
Han
Men
All ages	24.2	62.7	70.3	33.0	18.7	94.2	23.5	17.7	21.6	77.3	52.4	29.7	24.2	64.5	66.7	31.2
20–49 years	24.2	69.3	71.1	40.4	18.8	92.3	24.6	17.0	21.6	75.8	56.0	31.9	24.2	68.4	67.8	36.3
50–80 years	24.2	58.0	68.7	26.6	22.5	75.0	45.1	20.1	20.5	87.1	41.9	29.0	25.0	54.9	71.8	26.7
Women
All ages	34.2	71.9	64.8	36.7	35.4	69.2	67.5	36.7	32.7	77.2	55.8	33.1	33.7	83.1	58.1	41.2
20–49 years	33.6	73.7	67.2	40.9	32.0	94.4	52.6	47.1	33.9	66.1	70.3	36.5	33.9	90.5	65.6	56.1
50–80 years	36.8	52.6	70.7	23.2	35.4	70.0	51.2	21.2	34.8	66.8	50.6	17.4	36.7	56.9	65.5	22.4
Mongolian
Men
All ages	23.0	84.6	48.1	32.7	21.9	97.1	33.4	30.6	21.0	89.3	41.7	31.0	24.6	77.3	60.1	37.4
20–49 years	23.0	87.3	51.3	38.6	26.8	75.0	75.1	50.1	18.5	94.5	35.1	29.6	25.7	72.2	71.6	43.8
50–80 years	21.9	88.6	40.3	29.0	22.0	95.7	28.3	24.0	21.0	94.8	38.4	33.2	21.9	96.7	37.1	33.8
Women
All ages	35.7	71.3	66.3	37.6	40.0	55.6	84.6	40.2	36.4	62.6	68.6	31.2	36.4	80.5	66.9	47.5
20–49 years	35.7	55.6	70.7	26.3	34.8	100.0	61.8	61.8	31.1	82.9	43.5	26.3	36.4	70.0	74.1	44.1
50–80 years	36.7	73.5	54.5	28.0	41.0	60.0	81.3	41.3	36.5	77.9	46.9	24.9	36.6	84.2	46.6	30.8

BF%, body fat percentage; CVD, cardiovascular disease; Sen, sensitivity; Spe, specificity; YI, Youden's index.