广西壮族人群体脂率与常规肥胖指标的关系及其切点值研究

吕芳芳; 莫彩梅; 雷立地; 李金秀; 韦港杰; 陆佩妮; 许雪梅; 黄泫茜; 曾小云; 仇小强; 刘顺

doi:10.16462/j.cnki.zhjbkz.2024.08.011

广西壮族人群体脂率与常规肥胖指标的关系及其切点值研究

doi: 10.16462/j.cnki.zhjbkz.2024.08.011

1.
广西医科大学公共卫生学院流行病与卫生统计学教研室，南宁 530021
2.
广西南宁市第五人民医院儿童青少年心理科，南宁 530001
3.
广西医科大学公共卫生学院儿少卫生与妇幼保健教研室，南宁 530021

基金项目:

国家重点研发计划 2017YFC0907103

详细信息

通讯作者:
刘顺，E-mail: liushun@gxmu.edu.cn

中图分类号: R181.3
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- 被引次数: 0
出版历程
- 收稿日期: 2023-11-30
- 修回日期: 2024-04-17
- 网络出版日期: 2024-09-29
- 刊出日期: 2024-08-10

Relationship between body fat percentage and conventional obesity indicators and its cut-off values in Guangxi Zhuang population

1.
Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, Nanning 530021, China
2.
Department of Child and Adolescent Psychology, Nanning Fifth People′s Hospital, Nanning 530001, China
3.
Department of Maternal, Child and Adolescent Health, School of Public Health, Guangxi Medical University, Nanning 530021, China

More Information

Corresponding author: LIU Shun, E-mail: liushun@gxmu.edu.cn

摘要

摘要: 目的探讨广西壮族自治区35~＜75岁壮族人群体脂率(body fat percentage, BFP)与BMI和腰围(waist circumference, WC)的关系及其肥胖切点值。方法基于2018―2019年广西壮族自治区少数民族自然人群慢性病前瞻性队列的基线调查资料，选取12 311名壮族人群作为研究对象。通过曲线拟合确定BFP与BMI、WC的曲线关系，利用多元线性回归模型分析BFP的主要影响因素，分别构建BMI、WC预测BPF回归方程以计算BPF的超重和肥胖切点值，以BMI、WC判定标准为金标准计算BFP相应切点值的灵敏度、特异度和受试者工作特征(receiver operating characteristic, ROC)曲线下面积(area under curve, AUC)评估其诊断价值。结果 BMI对BFP的预测价值优于WC；基于我国肥胖标准BMI为28 kg/m²计算的BFP肥胖切点值在男性和女性中分别为23.4%和35.6%，AUC分别为0.732和0.847；对应的灵敏度和特异度，男性为0.581和0.882，女性为0.818和0.876。结论在广西壮族自治区人群中，基于我国肥胖标准计算BFP切点值应以BMI为参考，计算出来的切点值在男性中低于国际标准，而以BMI≥30 kg/m²时计算所得切点值均高于国际标准，其合理性还需综合考虑阳性预测值和未来肥胖相关疾病风险的研究进一步予以验证。
- 体脂率 /
- 肥胖 /
- 壮族人群 /
- 切点值
Abstract: Objective To investigate the association of body fat percentage (BFP) with body mass index (BMI) and waist circumference (WC) in Zhuang people aged 35- < 75 years in Guangxi, and to explore the cut-off values of obesity. Methods A total of 12 311 participants were selected from the baseline survey of the Prospective Cohort study of Chronic Diseases in Natural Minority Populations in Guangxi Zhuang Autonomous Region in 2018-2019. First, the relationship between BFP and BMI and WC was determined by curve fitting. Then, multiple linear regression model was used to analyze the main influencing factors of BFP, and regression equations for BMI and WC to predict BPF were constructed to calculate the overweight and obesity cut-off values of BPF. Finally, using BMI and WC criteria as the gold standard, the sensitivity, specificity and the area under curve (AUC) the receiver operating characteristic (ROC) of BFP corresponding cut-off values were calculated to evaluate its diagnostic value. Results BMI was superior to WC in predicting BFP. Based on the Chinese standard BMI of 28 kg/m², the BFP obesity cut-off values was 23.4% in men and 35.6% in women, and the AUC was 0.732 and 0.847, respectively. The corresponding sensitivity and specificity were 0.581 and 0.882 in males, and 0.818 and 0.876 in females. Conclusions In Guangxi Zhuang population, the BFP cut-off values calculated based on the Chinese obesity standard should be referred to BMI. The calculated obesity cut-off value for males is lower than the international standard. However, the cut-off values calculated with BMI≥30 kg/m² are higher than the international standard. The rationality of the BFP cut-off values needs to be further verified by considering the positive predictive value and the risk of obesity-related diseases in the future.
- Body fat percentage /
- Obesity /
- Zhuang ethnicity /
- Cut-off values

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图 1 研究人群筛选流程图

BFP：体脂率；WC：腰围。

Figure 1. Flow chart for screening the study population

BFP: body fat percentage; WC: waist circumference.

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表 1 研究对象一般特征及肥胖情况

Table 1. General characteristics and obesity prevalence of the study subjects

特征 Characteristic	总人数 Total ^① (n=12 311)	男性 Male ^① (n=5 968)	女性 Female ^① (n=6 343)	χ²值 value	P值 value
年龄组/岁Age group/years				187.9	< 0.001
35~＜45	2 679(21.8)	1 547(25.9)	1 132(17.8)
45~＜55	3 869(31.4)	1 976(33.1)	1 893(29.8)
55~＜65	2 992(24.3)	1 252(21.0)	1 740(27.4)
65~＜75	2 771(22.5)	1 193(20.0)	1 578(24.9)
受教育水平Level of education				1 689.0	< 0.001
小学及以下Primary school and below	6 257(50.8)	1 934(32.4)	4 323(68.2)
初中Middle school	3 768(30.6)	2 307(38.7)	1 461(23.0)
高中及以上High school and above	2 286(18.6)	1 727(28.9)	559(8.8)
家庭年收入Annual household income/10 000 yuan				303.3	< 0.001
＜3	6 535(53.1)	2 727(45.7)	3 808(60.0)
3~＜10	4 624(37.6)	2 488(41.7)	2 136(33.7)
≥10	1 152(9.4)	753(12.6)	399(6.3)
职业Career				273.6	< 0.001
农民Farmer	6 467(52.5)	2 677(44.9)	3 790(59.8)
非农Non farmer	5 844(47.5)	3 291(55.1)	2 553(40.2)
婚姻状况Marital status				52.4	< 0.001
未婚和其他Unmarried and others	1 368(11.1)	537(9.0)	831(13.1)
已婚Married	10 943(88.9)	5 431(91.0)	5 512(86.9)
吸烟Smoking				4 458.0	< 0.001
从未Never	9 145(74.3)	2 815(47.2)	6 330(99.8)
戒烟Quit smoking	695(5.6)	693(11.6)	2(0)
当前Current	2 471(20.1)	2 460(41.2)	11(0.2)
饮酒Drinking				943.3	< 0.001
否No	10 179(82.7)	4 290(71.9)	5 889(92.8)
是Yes	2 132(17.3)	1 678(28.1)	454(7.2)
体力活动Physical activity				91.7	< 0.001
不活动Inactive	6 564(53.3)	3 122(52.3)	3 442(54.3)
中等强度Moderate intensity	2 653(21.5)	1 160(19.4)	1 493(23.5)
高强度High strength	1 707(13.9)	993(16.6)	714(11.3)
中等兼有高强度Medium to high intensity	1 387(11.3)	693(11.6)	694(10.9)
BFP肥胖BFP obesity	1 978(16.1)	657(11.0)	1 321(20.8)	219.8	< 0.001
BMI肥胖BMI obesity	1 171(9.5)	573(9.6)	598(9.4)	0.1	0.743
WC肥胖WC obesity	3 691(30.0)	1 630(27.3)	2 061(32.5)	39.3	< 0.001
注：BFP, 体脂率；WC, 腰围。 ①以人数(占比/%)表示。 Note: BFP, body fat percentage；WC, waist circumference. ① Number of people(proportion/%).

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表 2 BFP与BMI、WC的曲线拟合分析

Table 2. Curve fitting analysis of BFP with BMI and WC

方程 Equation	BMI预测BFP BMI prediction for BFP		WC预测BFP WC prediction for BFP
方程 Equation	R²	F	R²	F
线性 Linear	0.884	93 969.421	0.862	76 981.040
二次 Secondary	0.890	50 016.741	0.863	38 930.012
三次 Thrice	0.892	34 038.505	0.863	38 930.012
注：WC, 腰围；BFP, 体脂率。 Note: WC, waist circumference; BFP, body fat percentage.

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表 3 BFP主要影响因素筛选

Table 3. Screening of main influencing factors of BFP

模型 Model	决定系数 R²	方程 Equation
性别 Gender	0.371	y= 28.379-11.906×性别 y= 28.379-11.906×gender
性别+职业 Gender+occupation	0.383	y= 27.503-12.23×性别+2.175×职业 y= 27.503-12.23×gender+2.175×occupation
性别+职业+体力活动 Gender+occupation+physical activity	0.388	y= 28.123-12.137×性别+1.94×职业-0.665×体力活动 y= 28.123-12.137×gender+1.94×occupation-0.665×physical activity
性别+职业+体力活动+吸烟 Gender+occupation+physical activity+smoking	0.389	y= 28.129-11.539×性别+1.942×职业-0.672×体力活动-0.638×吸烟 y= 28.129-11.539×gender+1.942×occupation-0.672×physical activity-0.638×smoking
性别+职业+体力活动+吸烟+家庭年收入Gender+occupation+physical activity+smoking+annual family income	0.390	y= 28.009-11.609×性别+1.719×职业-0.689×体力活动-0.633×吸烟+0.485×家庭年收入 y= 28.009-11.609×gender+1.719×occupation-0.689×physical activity-0.633×smoking+0.485×annual family income
性别+职业+体力活动+吸烟+家庭年收入+年龄Gender+occupation+physical activity+smoking+annual family income+age	0.391	y=27.485-11.588×性别+1.782×职业-0.671×体力活动-0.633×吸烟+0.538×家庭年收入+0.177×年龄 y=27.485-11.588×gender+1.782×occupation-0.671×physical activity-0.633×smoking+0.538×annual family income+0.177×age
注：BFP, 体脂率。 Note: BFP, body fat percentage.

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表 4 BFP预测方程构建

Table 4. Construction of BFP prediction equation

模型 Model	决定系数 R²	方程 Equation
BMI
线性 Linear	0.699	y=-9.463-12.198×性别+1.616×BMI y=-9.463-12.198×gender+1.616×BMI
二次 Secondary	0.700	y=-21.83-12.198×性别+2.666×BMI-0.022×BMI² y=-21.83-12.198×gender+2.666×BMI-0.022×BMI²
三次 Thrice	0.711	y=62.434-12.216×性别+0.437×BMI²-8.246×BMI-0.006BMI³ y=62.434-12.216×gender+0.437×BMI²-8.246×BMI-0.006BMI³
WC
线性 Linear	0.610	y=-12.679-13.729×性别+0.51×WC y=-12.679-13.729×gender+0.51×WC
二次 Secondary	0.611	y=-28.076-13.739×性别+0.888×WC-0.002×WC² y=-28.076-13.739×gender+0.888×WC-0.002×WC²
三次 Thrice	0.611	y==-23.636-13.74×性别+0.712×WC-0.000009661×WC³ y==-23.636-13.74×gender+0.712×WC-0.000009661×WC³
注：WC, 腰围；BFP, 体脂率。 Note: WC, waist circumference; BFP, body fat percentage.

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表 5 基于BMI、WC超重/肥胖标准计算的BFP切点值及诊断价值

Table 5. Corresponding BFP cut-off values and performance for diagnosing over-weight/obesity based on BMI and WC

肥胖程度判定依据 Basis for determining obesity level	BFP(%)	灵敏度 Sensitivity	特异度 Specificity	约登指数 Youden′s index	ROC曲线下面积 Area under ROC curve
男性Male
超重/肥胖Overweight/Obesity (BMI≥24 kg/m²)	17.3	0.692	0.759	0.451	0.726
超重/肥胖Overweight/Obesity (BMI≥25 kg/m²)	18.9	0.644	0.789	0.433	0.716
肥胖Obesity (BMI≥28 kg/m²)	23.4	0.581	0.882	0.463	0.732
肥胖Obesity (BMI≥30 kg/m²)	26.2	0.523	0.935	0.458	0.729
肥胖Obesity (WC≥90 cm)	19.5	0.618	0.785	0.403	0.701
女性Female
超重/肥胖Overweight/Obesity (BMI≥24 kg/m²)	29.5	0.822	0.775	0.597	0.798
超重/肥胖Overweight/Obesity (BMI≥25 kg/m²)	31.1	0.807	0.796	0.603	0.801
肥胖Obesity (BMI≥28 kg/m²)	35.6	0.818	0.876	0.694	0.847
肥胖Obesity (BMI≥30 kg/m²)	38.4	0.814	0.928	0.742	0.871
肥胖Obesity (WC≥85 cm)	30.7	0.711	0.740	0.451	0.726
注：WC, 腰围；BFP, 体脂率；ROC, 受试者工作特征。 Note: WC, waist circumference; BFP, body fat percentage; ROC, receiver operating characteristic.

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