Development of health-related waist circumference thresholds within BMI categories

OBJECTIVE: To develop and cross-validate waist circumference (WC) thresholds within BMI categories. The utility of the derived values was compared with the single WC thresholds (women, 88 cm; men, 102 cm) recommended by NIH and Health Canada. RESEARCH METHODS AND PROCEDURES: The sample included adults classified as normal weight (BMI = 18.5 to 24.9), overweight (BMI = 25 to 29.9), obese I (BMI = 30 to 34.9), and obese II+ (BMI > or = 35) from the Third U.S. National Health and Nutrition Examination Survey (NHANES III; n = 11,968) and the Canadian Heart Health Surveys (CHHS; n = 6286). Receiver operating characteristic curves were used to determine the optimal WC thresholds that predicted high risk of coronary events (top quintile of Framingham scores) within BMI categories using the NHANES III. The BMI-specific WC thresholds were cross-validated using the CHHS. RESULTS: The optimal WC thresholds increased across BMI categories from 87 to 124 cm in men and from 79 to 115 cm in women. The validation study indicated improved sensitivity and specificity with the BMI-specific WC thresholds compared with the single thresholds. DISCUSSION: Compared with the recommended WC thresholds, the BMI-specific values improved the identification of health risk. In normal weight, overweight, obese I, and obese II+ patients, WC cut-offs of 90, 100, 110, and 125 cm in men and 80, 90, 105, and 115 cm in women, respectively, can be used to identify those at increased risk.     

Age and sex influence the relationship between waist circumference and abdominal fat distribution measured by bioelectrical impedance

Waist circumference (WC) is a subrogate measurement of abdominal visceral fat (AVF) with a different normal threshold for men and women. However, age plays an important role in the relationship of WC with AVF. The hypothesis of the present work was that the adjustment of the WC, not only by sex but also by age, would improve WC prediction of AVF as measured by a new bioelectrical impedance (BIA) methodology. The study was carried out in 311 subjects (178 men and 133 women) with a body mass index between 18 and 35 kg/m². Abdominal fat composition was measured by BIA by using a new device recently developed specifically for the measurement of abdominal fat compartments (ViScan AB140;Omron Corp, Tokyo, Japan). Clinical, anthropometric, and biochemical data were also collected. There was a high correlation of WC with total abdominal fat and AVF in all age ranges and for both fat depots, which decreased with age in men but remained more stable in women. Age independently influenced the level of AVF in women and in those subjects with normal WC, increasing by 0.32 and 0.47 for each decade of age, respectively. In conclusion, age plays an important role in the association between WC and AVF with a high correlation existing in all age ranges. A specific BIA method that measures abdominal composition would be useful in women and in those subjects with normal WC as an indicator of AVF.     

Parental pre‐pregnancy BMI influences on offspring BMI and waist circumference at 21 years

Objectives: To investigate the prospective association between parental pre‐pregnancy BMI and adult male and female offspring BMI and waist circumference (WC). Methods: Sub‐sample of 2,229 parent‐offspring pairs with parental pre‐pregnancy BMI and offspring BMI and WC at 21 years were used from the MUSP (Mater‐University of Queensland Study of Pregnancy cohort). Multivariable results were adjusted for maternal factors around pregnancy (e.g. gestational weight and smoking during pregnancy) and offspring factors in early life (e.g. birth weight) and at 14 years (e.g. sports participation and mealtime with family). Results: After adjustments for confounders, each unit increase in paternal and maternal BMI, the BMI of young adult offspring increased by 0.33kg/m² and 0.35kg/m², and the WC increased by 0.76 cm and 0.62 cm, respectively. In the combination of parents' weight status, offspring at 21 years were six times the risk being overweight/obese (OW/OB) when both parents were OW/OB, compared to offspring of healthy weight parents. Conclusions: Prenatal parental BMI are independently related to adult offspring BMI and WC. Implications: Both prenatal paternal‐maternal weight status are important determinants of offspring weight status in long‐term. Further studies are warranted to investigate the underlying mechanisms.     

超重肥胖小学生BMI、腰围与体脂百分比及腹部脂肪率的关系

目的 研究超重肥胖小学生BMI、腰围与体脂百分比及腹部脂肪率的相关性.方法 于2010年5月,采用方便抽样方法在北京市东城区抽取2所小学,以两所学校医务处4月份体检记录中符合超重肥胖标准的162名2～5年级学生为研究对象,对其进行体检,测量其体脂百分比、腹部脂肪率和内脏脂肪等级,并计算BMI.采用t检验和秩和检验分析各指标性别间的差异;采用相关分析探索各脂肪分布指标(体脂百分比、腹部脂肪率和内脏脂肪等级)与BMI及腰围的相关性;运用单因素回归分析探索各变量对各脂肪分布指标的贡献率.结果 超重肥胖小学生体脂百分比为(43.62±2.98)％,腹部脂肪率为(28.06±6.02)％,内脏脂肪等级为7.51±3.43,BMI为(23.41±2.83) kg/m2.男生腰围、体脂百分比和腹部脂肪率分别为(78.57-±7.76)cm、(42.36±2.56)％和(26.47±5.39)％,女生分别为(73.34 ±7.22)cm、(45.88±2.26)％和(30.92±6.07)％,差异均有统计学意义(t值分别为-4.22、8.75和4.81,P值均＜0.01);男、女生内脏脂肪等级分别为8.86±3.42和5.09±1.70,差异有统计学意义(Z=-7.08,P＜0.01).BMI与体脂百分比的相关性及对其方差贡献率(r =0.563,R2 =31.7％)高于腰围(r=0.402,R2=16.1％)(P值均＜0.01),腰围与内脏脂肪等级的相关性及对其方差贡献率(r=0.723,R2=57.3％)高于BMI(r=0.621,R2=41.7％)(P值均＜0.01).结论 BMI对体脂百分比的相关性及预测能力优于腰围,腰围则对内脏脂肪的相关性和预测性较BMI强.     

广东省居民体重指数、腰围与血压关系的分析

目的　研究广东省居民体重指数、腰围与血压的关系。方法　按照多阶段分层整群随机抽样方法抽取样本 ,调查血压、身高、体重、腰围等指标 ,用描述性流行病学方法进行比较分析。结果　当体重指数为 <1 8 5、1 8 5～、2 4～、≥ 2 8时 ,血压均值分别为 1 1 2 34/70 77、1 1 6 73/73 1 4、1 2 5 71 /78 1 3、1 33 1 6 /82 5 4mmHg,高血压患病率分别为 1 0 3%、1 2 5 %、2 5 7%和 39 2 % ;腰围从正常到腹部肥胖 ,血压均值从 1 1 6 1 9/72 86mmHg上升到 1 2 7 5 9/79 2 4mmHg,高血压患病率从 1 2 4 %上升到 2 9 5 %。当体重指数≥ 2 4或腰围进入腹部肥胖时 ,血压增长速度明显加快 ,高血压患病率显著提高。结论　血压值和高血压患病率随着体重指数和腰围的增加而上升 ,是高血压的重要影响因素。     

Body mass index and waist circumference independently contribute to the prediction of nonabdominal, abdominal subcutaneous, and visceral fat

BACKGROUND: It is unknown whether the ability of waist circumference (WC) to predict health risk beyond that predicted by body mass index (BMI) alone is explained in part by the ability of WC to identify those with elevated concentrations of total or abdominal fat. OBJECTIVE: We sought to determine whether BMI and WC independently contribute to the prediction of non-abdominal (total fat - abdominal fat), abdominal subcutaneous, and visceral fat. DESIGN: Fat distribution was measured by magnetic resonance imaging in 341 white men and women. Multiple regression analysis was performed to measure whether the combination of BMI and WC explained a greater variance in non-abdominal, abdominal subcutaneous, and visceral fat than did BMI or WC alone. These fat depots were also compared after a subdivision of the cohort into 3 BMI (normal, overweight, and class I obese) and 3 WC (low, intermediate, and high) categories according to the classification system used to identify associations between BMI, WC, and health risk. RESULTS: Independent of age and sex, the combination of BMI and WC explained a greater variance in non-abdominal, abdominal subcutaneous, and visceral fat than did either BMI or WC alone (P < 0.05). For non-abdominal and abdominal subcutaneous fat, BMI was the strongest correlate; thus, by adding BMI to WC, the variance accrued was greater than when WC was added to BMI. However, when WC was added to BMI, the added variance explained for visceral fat was greater than when BMI was added to WC. Furthermore, within each of the 3 BMI categories studied, an increase in the WC category was associated with an increase in visceral fat (P < 0.05). CONCLUSIONS: BMI and WC independently contribute to the prediction of non-abdominal, abdominal subcutaneous, and visceral fat in white men and women. These observations reinforce the importance of using both BMI and WC in clinical practice.     

Sagittal abdominal diameter: comparison with waist circumference and its prediction of metabolic syndrome

Background  

For an “in the field” estimate of visceral adiposity, simple, inexpensive, non-invasive and highly repetitive methods are needed. The anthropometric measurement most commonly used as an indicator for visceral fat deposits is waist circumference (W). Nevertheless, there are some doubts with regard to the anatomic landmark points where the evaluation needs to be carried out. Sagittal abdominal diameter (SAD) is another anthropometric measurement that has been proposed for the estimation of visceral fat.     

北京市小学生BMI、腰围与代谢综合征的关系研究

目的 探讨儿童肥胖与代谢综合征(MS)的关系,分析体重指数(BMI)和腰围与MS组分的关系.方法 在北京市海淀区的8所学校选取1 928名7～14岁小学生,测量其身高、体重和各MS组分,分析不同营养状况小学生MS组分的差异.采用多元线性回归和Logistic回归模型,分析BMI、腰围与MS组分的关系.结果 除空腹血糖外,血压、血脂、腰围在不同营养状况小学生之间差异有统计学意义(P＜0.05),表现为肥胖组＞超重组＞体重正常组.不同营养状况小学生高SBP、高TG、低HDL-C、中心性肥胖的检出率差异均有统计学意义(P＜0.01),随BMI增加异常率增高.多元线性回归发现BMI和腰围均与除中心性肥胖外的其他MS组分有独立的相关性;除TC外, “腰围”对于其他MS组分的标化回归系数绝对值略大于“BMI”.除DBP外,对于其他MS组分,BMI与腰围同时升高(超重/肥胖且腰围≥P90)的OR值＞BMI和腰围有且仅有一项偏高(超重/肥胖或腰围≥P90)＞体重正常且腰围正常.结论 儿童肥胖与代谢综合征关系密切,联合应用腰围和BMI有利于评估MS风险.     

BMI,waist circumference,and clustering of cardiovascular risk factors in Japanese adults

Objective  

To examine whether the association between waist circumference (WC) and clustering of cardiovascular risk factors varies with obesity (BMI) status.     

Fibre intake among the Belgian population by sex-age and sex-education groups and its association with BMI and waist circumference

The objectives of the present study were to assess total dietary fibre intake and the main contributors to fibre intake in the Belgian population by sex-age and sex-education groups and to investigate its relationship with BMI and waist circumference (WC). The participants of the Belgian food consumption survey (2004) were randomly selected. Information about food intake was collected using two repeated, non-consecutive 24 h recall interviews. A total of 3083 individuals ( ≥ 15 years; 1546 men and 1537 women) completed both interviews. The main contributors to total fibre intake (17·8 g/d) were cereals and cereal products (34 %; 5·9 g/d), potatoes and other tubers (18·6 %; 3·3 g/d), fruits (14·7 %; 2·8 g/d) and vegetables (14·4 %; 2·6 g/d). Legume fibre intake was extremely low (0·672 %; 0·139 g/d). In all sex-age and sex-education groups, total fibre intake was below the recommendations of the Belgian Superior Health Council. Men (21 g/d) consumed significantly more fibre than women (17·3 g/d) (P < 0·001). Lower educated men and higher educated women reported the highest fibre intake. A significant inverse association was found between total fibre intake and WC (β = - 0·118, P < 0·001). Fruit-derived fibre was positively associated with WC (β = 0·731, P = 0·001). In summary, total fibre intake was inversely associated with WC, whereas fruit-derived fibre intake was positively associated with WC in the Belgian population.     

Relationship of BMI, waist circumference, and weight change with use of health services by older adults

OBJECTIVE: To examine the relationship of BMI, waist circumference (WC), and weight change with use of health care services by older adults. RESEARCH METHODS AND PROCEDURES: This was a prospective cohort study conducted from 2001 to 2003 among 2919 persons representative of the non-institutionalized Spanish population > or =60 years of age. Analyses were performed using logistic regression, with adjustment for age, educational level, size of place of residence, tobacco use, alcohol consumption, and presence of chronic disease. RESULTS: Obesity (BMI > or = 30 kg/m(2)) and abdominal obesity (WC >102 cm in men and >88 cm in women) in 2001 were associated with greater use of certain health care services among men and women in the period 2001-2003. Compared with women with WC < or = 88 cm, women with abdominal obesity were more likely to visit primary care physicians [odds ratio (OR): 1.36; 95% confidence limit (CL): 1.06-1.73] and receive influenza vaccination (OR: 1.30; 95% CL: 1.03-1.63). Weight gain was not associated with greater health service use by either sex, regardless of baseline BMI. Weight loss was associated with greater health service use by obese and non-obese subjects of both sexes. In comparison with those who reported no important weight change, non-obese women who lost weight were more likely to visit hospital specialists (OR: 1.45; 95% CL: 1.02-2.06), receive home medical visits (OR: 1.61; 95% CL: 1.06-2.45), be hospitalized (OR: 1.88; 95% CL: 1.29-2.74), and have more than one hospital admission (OR: 2.31; 95% CL: 1.19-4.47). DISCUSSION: Obesity and weight loss are associated with greater health service use among the elderly.     

体质指数和腰围对浙江地区成年人糖尿病发生影响的前瞻性研究

目的 探讨BMI和腰围对成年人糖尿病发病的影响。方法 使用"中国慢性病前瞻性研究"（CKB）浙江省桐乡市数据,剔除基线时自报患有恶性肿瘤、心脏病、脑卒中和糖尿病患者后,纳入分析30~79岁53 916人。采用Cox比例风险模型计算糖尿病发病风险比（HR）。结果 调查对象累计随访391 512人年（平均随访7.26年）。随访期间,男性944人和女性1 643人被新诊断为糖尿病。多因素调整后,与BMI正常组的人群相比,男性超重和肥胖组糖尿病发病的HR值（95%CI）分别为2.72（95%CI：2.47~2.99）和6.27（95%CI：5.33~7.36）。女性超重和肥胖组HR值（95%CI）分别为2.19（95%CI：2.04~2.36）和3.78（95%CI：3.36~4.26）;与腰围正常组的人群相比,男性Ⅰ级（85.0~89.9）和Ⅱ级中心性肥胖（≥ 90.0）组糖尿病发病的HR值（95%CI）分别为2.56（2.22~2.95）和4.66（4.14~5.24）。女性Ⅰ级（80.0~84.9）和Ⅱ级中心性肥胖（≥ 85.0）组HR值（95%CI）分别为1.99（1.80~2.21）和3.16（2.90~3.44）。结论 超重/肥胖以及中心性肥胖人群糖尿病发病风险均会升高。在开展控制体重预防糖尿病的同时,更应控制腰围。     

Association of waist circumference with muscle and fat mass in adults with a normal body mass index

BACKGROUND/OBJECTIVESWe aimed to investigate the association of waist circumference (WC) with body composition among individuals with a normal body mass index (BMI) to distinguish muscle and fat mass, as both affect health differently.SUBJECTS/METHODSWe analyzed dual-energy X-ray absorptiometry data (derived from the Korean National Health and Nutrition Survey, which includes information on fat and lean mass) of 7,493 adults with a normal BMI. Subjects were categorized into four groups of increasing WC. The fourth group was defined as being centrally obese. Each number of subjects are as follows: 1,870, 695, 231, and 39 among men and 3,054, 1,100, 406, and 98 among women. We conducted a sex-stratified linear regression analysis of body composition according to WC group after adjustments for covariates.RESULTSWe observed a positive association of body fat with increasing WC in both men and women (all P for trend: < 0.001). The adjusted mean values for percent body fat with 95% confidence intervals (CIs) according to the four WC groups in ascending order were 17.8 (17.5–18.3), 21.0 (20.6–21.5), 22.1 (21.5–22.8), and 25.1 (24.2–26.1) in men and 29.7 (29.4–30.0), 32.0 (31.6–32.3), 32.9 (32.4–33.4), and 34.7 (33.2–36.1) in women. However, there was an inverted J-shaped association between muscle mass and WC. The fourth group had a higher percent body fat and lower muscle mass than other groups. The adjusted mean values for appendicular skeletal muscle mass index (kg/m²) with 95% CIs according to the four WC groups in ascending order were 7.55 (7.51–7.59), 7.62 (7.56–7.68), 7.65 (7.56–7.74), and 7.22 (7.04–7.41) in men and 5.83 (5.80–5.85), 5.96 (5.92–6.00), 6.03 (5.96–6.10), and 5.88 (5.73–6.03).CONCLUSIONSThere was a positive association between body fat and WC among individuals with normal BMI; conversely there was an inverted J-shaped association between lean body mass and WC. Our findings support the WC measurement should be included in obesity evaluations for adults with a normal BMI.     

Sugar-sweetened carbonated beverage consumption correlates with BMI,waist circumference,and poor dietary choices in school children

Background  

The prevalence of obesity and overweight is increasing globally. Frequently coexisting with under-nutrition in developing countries, obesity is a major contributor to chronic disease, and will become a serious healthcare burden especially in countries with a larger percentage of youthful population. 35% of the population of Saudi Arabia are under the age of 16, and adult dietary preferences are often established during early childhood years. Our objective was to examine the dietary habits in relation to body-mass-index (BMI) and waist circumference (W_C), together with exercise and sleep patterns in a cohort of male and female Saudi school children, in order to ascertain whether dietary patterns are associated with obesity phenotypes in this population.     

珠海市斗门区居民体重指数、腹围与血压关系的研究

目的研究珠海市斗门区居民体重指数（BMI）、腹围与血压的关系,为控制体重及向心性肥胖从而降低高血压发病率提供参考。方法按照分层、整群、随机相结合的方法,抽取斗门区两镇,对其农村居民进行面对面调查和体检。结果体重指数为〈24、24～28、≥28时,血压均值分别为125．49／79．81、135．62／85．42、／44．63／93．77mmHg,高血压患病率分别为27．5％、47．6％、71．0％;腹围从正常到腹部肥胖,血压均值从124．67／79．65mmHg上升到135．50／85．09mmHg,高血压患病率从25．5％上升到48．5％。体重指数对血压、高血压患病率的预测效果高于腹围;超重、肥胖与正常组相比,发生高血压的危险性分别增加3．0和5．2倍。结论珠海市斗门区居民血压值和高血压患病率随着体重指数、腹围的增加而上升,体重指数是预测高血压的重要指标,应采取有针对性的措施,控制体重指数在正常范围内。     

A five year longitudinal study investigating the prevalence of childhood obesity: comparison of BMI and waist circumference

Objective

The purpose of this study was to examine the prevalence of obesity over time in the same individuals comparing body mass index (BMI), waist circumference (WC) and waist to height ratio (WHtR).

Study design

Five year longitudinal repeated measures study (2005–2010). Children were aged 11–12 (Y7) years at baseline and measurements were repeated at age 13–14 (Y9) years and 15–16 (Y11) years.

Methods

WC and BMI measurements were carried out by the same person over the five years and raw values were expressed as standard deviation scores (sBMI and sWC) against the growth reference used for British children.

Results

Mean sWC measurements were higher than mean sBMI measurements for both sexes and at all assessment occasions and sWC measurements were consistently high in girls compared to boys. Y7 sWC = 0.792 [95% confidence interval (CI) 0.675–0.908], Y9 sWC = 0.818 (95%CI 0.709–0.928), Y11 sWC = 0.943 (95%CI 0.827–1.06) for boys; Y7 sWC = 0.843 (0.697–0.989), Y9 sWC = 1.52 (95%CI 1.38–0.67), Y11 sWC = 1.89 (95%CI 1.79–2.04) for girls. Y7 sBMI = 0.445 (95%CI 0.315–0.575), Y9 sBMI = 0.314 (95%CI 0.189–0.438), Y11 sBMI = 0.196 (95%CI 0.054–0.337) for boys; Y7 sBMI = 0.353 (0.227–0.479), Y9 sBMI = 0.343 (95%CI 0.208–0.478), Y11 sBMI = 0.256 (95%CI 0.102–0.409) for girls. The estimated prevalence of obesity defined by BMI decreased in boys (18%, 12% and 10% in Y 7, 9 and 11 respectively) and girls (14%, 15% and 11% in Y 7, 9 and 11). In contrast, the prevalence estimated by WC increased sharply (boys; 13%, 19% and 23%; girls, 20%, 46% and 60%).

Conclusion

Central adiposity, measured by WC is increasing alongside a stabilization in BMI. Children appear to be getting fatter and the additional adiposity is being stored centrally which is not detected by BMI. These substantial increases in WC are a serious concern, especially in girls.     

上海市健康体检人群BMI、腰围与甲状腺自身抗体阳性发生风险的关联研究

目的 分析上海市健康体检人群BMI、腰围(WC)与甲状腺自身抗体阳性发生风险的关系。方法 采用多阶段整群抽样法随机选取2019年1—9月在华东疗养院健康体检中心的3 840名上海市健康体检人群,收集人口学资料、体格检查及实验室指标。采用多因素Logistic回归和限制性立方样条(RCS)探索BMI、WC与甲状腺自身抗体阳性发生风险的关系。结果 上海市健康体检人群甲状腺自身抗体阳性发生率为23.2%(892/3 840),RCS结果显示BMI、WC的连续变化与甲状腺自身抗体阳性呈线性剂量-反应关系(P_{fornon-linearity}>0.05)。多因素Logistic回归分析结果显示,以BMI与WC定义的肥胖人群,其甲状腺自身抗体阳性发生风险分别是非肥胖人群的1.82倍和2.20倍;单纯腹型肥胖(OR=2.06)和复合型肥胖(OR=2.79)均是甲状腺自身抗体阳性的独立危险因素。结论 上海市健康体检人群BMI、WC的增加会显著增加甲状腺自身抗体阳性风险,应关注存在复合型肥胖及单纯腹型肥胖的人群,并制定合理的肥胖管理方案降低内脏脂肪含量。