Services on Demand
On-line version ISSN 1806-9940
Rev Bras Med Esporte vol.12 no.3 Niterói May/June 2006
Anthropometric indicators of fat-mass excess among women*
Indicadores antropométricos de exceso de grasa corporal en mujeres
Cassiano Ricardo RechI; Edio Luiz PetroskiII; Rosane Carla Rosendo da SilvaIII; João Carlos Nunes da SilvaIV
em Educação Física do Centro de Desportos da Universidade
Federal de Santa Catarina Florianópolis/Santa Catarina/Brasil (crrech
IIProfessor Dr., Centro de Desportos da Universidade Federal de Santa Catarina, Coordenador e Líder do Núcleo de pesquisa em Cineantropometra e Desempenho Humano Florianópolis/Santa Catarina/Brasil (firstname.lastname@example.org)
IIIProfessora Dr., Centro de Desportos da Universidade Federal de Santa Catarina Florianópolis/Santa Catarina/Brasil (email@example.com)
IVMédico Especialista em Clínica Médica do Centro de Ciências da Saúde da Universidade Federal de Santa Maria Santa Maria/Rio Grande do Sul/Brasil
The aim of this study was to determine the sensitivity, specificity and the level of association between two indicators of overweight and obesity among women. Sixty-five women (from 50-77 years of age) participated in the study. They showed mean body mass of 70.3 ± 11 kg and mean stature of 158.0 ± 5.5 cm. The body mass index (BMI) and the reciprocal of ponderal index (RPI) were computed. Percent of body fat, estimated by the dual-energy x-ray absorptiometry (%BFDXA), was used as the gold standard measure. Data analyses consisted of descriptive statistics, Pearson's linear correlation and the Kappa index. The means for BMI, RPI and %BFDXA were, respectively, 28 ± 4.2 kg.m-2, 38 ± 1.9 cm.kg-1/3 and 38.1 ± 6.0. A high prevalence of overweight was detected, regardless the method (%BFDXA = 89.2%, > 28%, RPI = 83,1% and BMI = 73,8%). Pearson's lineal correlation coefficients between %BFDXA and RPI (r = -0.76) and %BFDXA and BMI (r = 0.72) were both significant (p < 0.01). The Kappa index showed an association of 0.31 between the %BFDXA and BMI and of 0.48 between %BFDXA and RPI. The anthropometric indicators presented high sensitivity and specificity values (80% and 55% for BMI 87,7% and 75% for RPI, respectively). The ROC curve analyses showed areas under the curve of 0.80 for BMI and 0.83 for RPI, which did not differ (p > 0.05). The cutoff points of 27.3 kg.m-2 for BMI and 39.3 cm.kg-1/3 for RPI presented a better relationship between sensitivity and specificity in determining overweight. Therefore, it is concluded that both BMI and RPI are good indicators for identifying overweight in women aged over 50 years as they presented high sensitivity and specificity.
Keywords: Body mass index. Reciprocal of ponderal index. Obesity. Overweight. Middle-aged women.
El objetivo de este estudio fue determinar la sensibilidad, la especificidad y la concordancia entre dos indicadores de exceso de grasa en mujeres. Fueron evaluadas 65 mujeres (50-77 años de edad), con masa corporal media de 70,3 ± 11 kg, estatura de 158,0 ± 5,5 cm, que permitió el cálculo del índice de masa corporal (IMC) y del recíproco del índice ponderado (RIP). El porcentaje de grasa, medido a través de la absortometría radiológica de doble energía (%GDEXA), fue utilizado como método de referencia. La estadística descriptiva, la correlación lineal de Pearson (r) y el índice de Kappa (k) fueron usados para analizar los datos. El IMC, el RIP y el %GDEXA presentaron escores medios de 28 ± 4,2 kg.m-2; 38 ± 1,9 cm.kg-1/3; y 38,1 ± 6,0%, respectivamente. La persistencia de exceso de grasa fue de 89,2% para el %GDEXA. El RIP y el IMC presentaron persistencias de exceso de grasa de 83,1% y 73,8%, respectivamente. Los coeficientes de correlación lineal de Pearson entre %GDEXA y el RIP (r= -0,76) y entre %GDEXA y el IMC (r = 0,72) fueron significativos (p < 0,01). El índice de Kappa identificó una asociación de k = 0,31 entre las medidas de %GDEXA y IMC, y de k = 0,48 entre %GDEXA y RIP. Los indicadores antropométricos presentaron índices de sensibilidad y especificidad altos (IMC = 79,3% y 71,4%; RIP = 90% y 71,4% respectivamente). El análisis a través de la Curva ROC (Receiver Operator Characteristic Curve) presentó áreas sobre la curva de 0,80 para IMC y de 0,83 para RIP, datos que no difirieron significativamente (p < 0,05). Los puntos de corte de 26,2 kg.m-2 para IMC y 39,3 cm.kg-1/3 para RIP demostraron la mejor relación entre sensibilidad y especificidad a la hora de identificar el exceso de grasa. Por tanto, se concluye que los indicadores antropométricos analizados no difieren respecto a la identificación de exceso de grasa, y ambos presentan valores de sensibilidad y especificidad altos al evaluar el exceso de grasa en mujeres por encima de los 50 años de edad.
Palabras-clave: Índice de masa corporal. Recíproco del índice ponderado. Obesidad. Sobrepeso. Mujer.
Malnutrition, overweight and obesity represent risk factors to many diseases(1,2). The World Health Organization (WHO) identified malnutrition as the main risk factor to disease development for all causes in developing countries, and overweight is in tenth place, in developed and in developing countries(1,3).
In the US, various studies report that about 65% of the population is overweight and 30% is considered clinically obese(4,5). The survey conducted in 2001 showed that 20 American states presented overweight prevalence between 15 and 19%, and in three states this index surpassed 25%, showing an increase of 5.6% a year(6). In Europe, it is estimated that 10-20% of men and 10-25% of women are overweight.
Data from IBGE (Instituto Brasileiro de Geografia e Estatística) and of two population surveys conducted in Brazil, in the last years (Estudo Nacional da Despesa Familiar ENDEF and Pesquisa Nacional sobre Saúde e Nutrição PNSN)(2,7), indicate a significant increase in prevalence of overweight and obesity in the population. Among people older than 60 years of age, the results show a prevalence of overweight around 27% in men and 38% in women, and 10% of that population is considered obese(2,7).
The increase in the prevalence of overweight and obesity has led WHO(1) to determine overweight a public health problem, since it is related to the increased risk to disease development, and leads to serious health problems, when associated with an inadequate lifestyle (smoking, alcohol, inactivity)(8).
Clinical evaluation of overweight and obesity in epidemiological studies has commonly been conducted by using anthropometric measures of body mass and stature or a combination of both, due to their practicability, low cost and easy interpretation of results.
Other indicators, such as body mass divided by stature, the cube root of body mass divided by stature (ponderal index) and stature divided by cube root of body mass (Sheldon index), are also used to identify malnutrition, overweight and obesity(9). The Body Mass Index (BMI), developed by Quetelet in 1871, is one of the most used procedures to evaluate the overweight and obesity in epidemiologic studies.
Such indicator presents high association with many chronic and non-transmissible diseases(10,11), and risk for various health conditions, such as increased risk for developing cardiovascular diseases, hypertension(12), LDL-cholesterol, increase in blood triglycerides concentration in the diabetes(12,13) and some kinds of cancer(14).
Some authors suggest that, despite BMI being internationally accepted as an indicator of nutritional state, it presents limitations: 1) the relationship with body proportionality, people with short legs will have increased BMI; 2) relationship with fat-free mass, especially in men, because a high muscle mass can lead to misinterpretation of obesity; 3) correlation with stature, despite being low, it can be significant, especially in children and adolescents(15). In old people, sarcopenia (muscle mass reduction), accumulation of and centrally distributed fat are limiting factors for BMI use(16,17).
Therefore, other indicators have been tested concerning their sensitivity and specificity in nutritional status identification in epidemiological studies. The Reciprocal of Ponderal Index (RPI) is one of these indicators(9), and is mathematically more robust indicator for identifying fat excess than BMI(17), since body mass measurement (tridimensional measurement) is on the denominator and represents more accurately changes in body structure(9,17). However, there are few studies that relate RPI with the presence of chronic and non-transmissible diseases or show this evidence.
Besides overweight and obesity indicators, estimation of percent of body fat (%BF) has also great acceptability for fat-mass excess identification(18). The %BF estimation is commonly performed by hydrodensitometry technique (hydrostatic weighting), which has been widely accepted as the "gold standard" technique(18,19). In old people, this evaluation, which needs submersed weight, is hard to be taken and also demands a long time(20).
Thus, other laboratory techniques have been developed and improved to %BF estimate(21,22). The dual-energy x-ray absorptiometry (DEXA) seems to be an alternative to the problems presented by hydrodensitometry. This technique allows for a rapid evaluation and with reliable data when comparing to hydrostatic weighting. Some authors consider DEXA as a successor for hydrodensitometry because of the technique evolution over the years(18,20,21).
Although being considered of highly operational cost and having some limitations, such as the use of constant values for tissue hydration and non age-specific softwares(22), DEXA has been accepted in validation studies and in body composition evaluation of new anthropometric techniques.
However, the use of anthropometric indicators for nutritional status determination presents several problems when compared to body fat analyses, especially in older people.
Some examples illustrate this fact. In a study conducted by Sardinha et al.(23), a mean %BF of 42.6% was reported with older women, while mean BMI was 27.8 kg.m-2. In the study of Hortobágyi et al.(24), with middle-aged men and women, it was observed that 40% of the women where classified as obese according to the %BF criterion, however, when BMI cutoff was adopted, only 12% were classified as such.
These examples reveal a serious problem in score interpretation obtained by anthropometric indicators in older people, demonstrating that the same subject can have a different diagnosis according to the applied criterion.
Thus, with the limitations presented for estimates of body components in population studies, it is necessary, and urgent, to develop and validate anthropometric indicators of easy application, low cost and with a large applicability such as BMI and RPI.
Hence, this study had the aim to analyze BMI and RPI sensitivity and specificity in the identification of fat-mass excess in women older than 50 years of age, having DEXA as reference measurement.
The study was characterized as a prospective correlational descriptive(25). Sixty-five women between 50 and 77 years of age were evaluated. The sample was selected by a non-probabilistic procedure. Women from groups of physical activities in the city of Santa Maria-RS were invited to participate and all of them were apparently healthy. To be included in the sample, the subjects could not wear any kind of fixed prosthesis, be under medical treatment, diets or be on diuretics, which could interfere with the study results.
Before the study, the participants were asked to sign an inform consent. The subjects were distributed into five age groups to better represent the age relationship: 50-55 years (n = 12); 56-60 years (n = 14); 61-65 years (n = 12); 66-70 years (n = 14) and 71-77 years (n = 13).
The anthropometric data were body mass (kg) and stature (cm). Measurements followed the procedures described Alvarez and Pavan(26), all taken by the same evaluator. A scale with a resolution of 100 g (ARJA) and a stadiometer with 1 mm of resolution (Sanny) were used for data collection.
From body mass scores (BM) and stature (ST), BMI and RPI were calculated according to the following equations:
To %BF evaluation, DEXA exams were performed in a HOLOGIC QDR 4500 fan Beam X-Ray Bone Densitometer (Walthan, MA 02154-USA) from the Instituto de Densitometria Óssea de Santa Maria-(OSTEOLAB), RS. To guarantee measurement quality, the equipment was daily calibrated according to the manufacturer's specifications. All the examinations were conducted by a technician certified in medical radiology. Only total fat-mass measure, expressed in percent (%BFDEXA), was considered for this study.
Subjects were recommended to follow a routine procedure before the exam, in order to avoid measurement error: to maintain regular diet on the previous days, not to smoke, not to ingest alcoholic drinks 24 hours before the test, not to use diuretic medication, and not to change the hydration pattern.
Allowing for data analysis, subjects were classified either as normal or with fat-mass excess, using the cutoff points for BMI, RPI e %BFDEXA shown in box 1.
The BMI > 27 kg.m-2 cutoff point was used to determine sensitivity and specificity and to represent fat-mass excess, according to classification to the elderly(27). The cutoff point established by Ricardo and Araújo(17) for children and adolescents was considered for RPI classification, due to the lack of specific cutoff points for older people. The %BF classification followed Lohman(18) recommendation for women over 50 years of age, where obesity is characterized by more than 30% of fat mass.
Sensitivity and specificity analyses of fat-excess indicators (BMI and RPI) and %BFDEXA was also used, considering false-positive, false-negative, true negative and true positive cases as shown in figure 1.
In this case, the term sensitivity refers to quality of the test in diagnosing cases of "true disease", that is, it informs the accuracy of the anthropometric indicators (RPI e BMI) in identifying people with fat excess, who are also diagnosed as such in relation to the criterion measurement(28). The higher the sensitivity, the lower will be the number of false-negative cases. The specificity concerns of the subjects called not sick or at risk, that is, those who do not present fat excess and were classified as normal by the anthropometric indicators (RPI and BMI)(28). The higher a test specificity, the lower the number of subjects classified as sick, when they are truly not (false-positive cases).
Data were analyzed using the Shapiro-Wilk test to check for normality. Descriptive procedures were applied (mean, standard deviation, minimum and maximum values) and data frequency. Pearson correlation and the Kappa index were used to identify the association between BMI and RPI scores with DEXA. The ROC (Receiver Operator Characteristic) curve analysis was used, allowing for comparison of areas under the curve, in overweight identification in relation to criterion measurement(28), using a confidence interval of 95%. The analyses were performed in the SPSS® statistical package forWindows (version 11.0).
Table 1 presents the mean and standard deviation for age, body mass, stature, %BF, BMI and RPI, as well as the range of values in order characterize the sample.
The BMI and RPI mean values were classified as fat excess(1,10,17), what was already expected, since fat mass increases with age(30). Concerning the percent of body fat (%BFDEXA), the mean was 38,1 ± 6% (23,6%-52,1%), which was also classified as fat excess(18).
Table 2 shows the mean values and standard deviation for the anthropometric indicators by age. No significant differences were observed among age groups (p > 0,05).
Women between 56-60 years of age showed the lowest values for all fat excess indicators (%BF, BMI e RPI), although not significant (p > 0,05).
Table 3 presents the prevalence of fat excess according to different indicators. It is observed that 89.2% of the sample showed fat excess when the %BFDEXA was used as reference. Such prevalence decreased by 6.1% when using RPI indicator and by 15.4% when using BMI.
Sensitivity and specificity of BMI and RPI were tested with %BFDEXA scores (table 4). It can be observed that for false-negative cases, RPI was more precise in identifying individuals with fat excess, but classified as not obese by the BMI criterion.
The results show that specificity values for BMI and RPI indicators were similar in the verification of fat-mass excess (71.4%) and in the classification of false-negative cases (28.6%).
Table 5 presents the Pearson correlation coefficients and the Kappa index between fat excess indicators. It may be observed that DEXA correlations with BMI and RPI were statistically significant (p < 0.01).
The correlation between DEXA and BMI was 0.72 (p < 0.01), suggesting a strong positive association, that is, when fat-mass values increase, BMI values increase as well. The correlation between DEXA values and RPI was also statistically significant (p < 0.01), which reveals a strong association between these indicators. However, differently from BMI, this indicator presented a negative association (r = - 0.76), i.e., an inverse relationship.
The Kappa index was used to analyze the association between anthropometric indicators and DEXA (table 5). Values of 0.31 for BMI and 0.48 for RPI were observed. These values are considered moderate for the analyses of categorical variables.
Figure 2 presents the ROC curve for the two anthropometric indicators. The area under the curve for BMI was 0.80 (0.68-0.89). The cutoff point value of 26.2 kg.m-2 presented the most adequate balance between sensitivity (75.4%) and specificity (75%). The RPI presented an area under the curve of 0.83 (0.72-0.91), the cutoff point identified at 39.3 cm.kg-1/3 demonstrated sensitivity of 85.7% and specificity of 75%.
The comparison between the areas under the ROC curve, showed no significant difference (p = 0.637). There was a difference of 0.03 between the curves (CI = 0.09-0.15; 95%).
The concern to establish sensitivity and specificity of anthropometric indicators of fat-excess is justified by the constant alterations in body composition of middle-aged and elder population(30,31). Thus, the relationship between weight gain and fat accumulation differs from that observed in young adults.
The aging process causes decrease in the ability to predict the amount of fat-mass by anthropometric indicators. In this study, the BMI and RPI explained 52% (R2 = 0.523) and 59% (R2 = 0.595), respectively, of the %BF variance. Such values are smaller than those observed in young adults, which present a higher relationship(9,32,33).
This decrease of the ability of prediction is reflected in the recommended cutoff points for identifying fat excess in middle-aged and elder adults. In other words, the adoption of generalized cutoff points for fat excess in specific groups, as analyzed in this study, can present distortions(23,34,35).
The different prevalence of fat excess can be observed in table 3. The sample presented 89.2% of fat excess by DEXA, however, the prevalence was reduced to 73.8% when the BMI scores were used and it was closer to DEXA (83.1%) when using RPI.
RPI presented a prevalence closer to that found by %BFDEXA measurement, being more sensitive in the identification of false-negative cases (table 4).
The false-negative cases are those who need more attention when groups with older individuals are analyzed, since fat-mass accumulation and distribution differ across ages(30,31). Although the results of this study did not present a significant increase in %BFDEXA with age, some studies have demonstrated increase in fat excess indicators and obesity(23,35) in older ages.
Concerning specificity analyses, the two anthropometric indicators (BMI and RPI) presented the same results (71.4%) in relation to fat excess diagnosis. However, BMI presented 20.6% of false-negative cases (12 cases), while two false-positive cases were identified (table 4).
The results corroborate with other investigations that found 30% of false-positive cases in adult women(32). They are also similar to results reported by Smalley et al.(9), relating six fat excess indicators with %BF obtained by hydrostatic weighting. The authors identified that 44.6% of the women in the sample were false-negative cases and 1.8% false-positive using BMI in comparison to hydrostatic weighting.
Hortobágyi et al.(24), evaluating 365 women between 14-45 years of age, found 26.9% of sensitivity and 98.2% of specificity, with 9.3% of false-positive cases and 32.9% of false-negative cases. Data in that study differ from those in this study. The reason for such difference may lie in the definition of cutoff points to determine fat-mass excess.
Although BMI presented an agreement between the sensitivity values with RPI diagnosis, it was lower when identifying false-negative cases (specificity).
Such evidence is confirmed by the agreement index (Kappa) for both indicators, in which the indexes are considered moderate, regardless Pearson correlation coefficients being significant, which is supported by other studies in the area(32,33,35).
RPI presented a correlation coefficient of 0.76 with %BFDEXA (table 5), value lower than that reported by Smalley et al.(9) (r = 0.86) and a correlation of 0.84 with BMI. In a study conducted with post-menopause women, the correlation values found were 0.83 between BMI and relative fat measured by DEXA(34,35).
Regarding the analysis of the ROC curve, the comparison between curves (figure 1) did not show significant difference for the two fat excess indicators. Although the cutoff points for diagnosis of fat excess were BMI > 27 kg.m-2 and RPI < 41 cm.kg-1/3, they did not differ in relation to criterion measurement, an adjustment for the cutoff points of > 26.2 kg.m-2 for BMI and of < 39.3 cm.kg-1/3 for RPI, produced a better diagnosis for fat excess.
Therefore, the use of these cutoff points allowed sensitivity and specificity of 75.4% and 75%, respectively, for BMI. In other words, concerning the cutoff point adopted in this study, there would be an increase in the diagnosis of the false-positive cases. BMI sensitivity would be reduced in 3.9%, while the specificity would be 3.6% higher. On the other hand, RPI would have a loss of 4.3% in sensitivity and an increase of 3.6% for specificity.
The decrease of BMI relationship with fat excess diagnosis has already been reported in other studies, showing that the established cutoff points must be cautiously observed in specific groups(23,34,35). An investigation involving 317 post-menopause women demonstrated that the cutoff point of 24.9 kg.m-2 for BMI was the best fat excess discriminator(35). These data corroborate with those presented by Wellens et al.(34), who observed that the cutoff point of 23 kg.m-2 would present a better balance between sensitivity and specificity in women. Sardinha and Teixeira(23), in a study with elder women, concluded that the cutoff point of 25.5 kg.m-2 was the best discriminator point of fat excess in that population, agreeing with the data found in this study, in which BMI presented a cutoff point of 26.2 kg.m-2.
The differences found in the cutoff points in various studies are related to the criterion measurement used and to the cutoff point established for identification of fat excess in elders. Some authors have used values between 30-38% of body fat as a cutoff point.
Nevertheless, in all studies where BMI is suggested as the best fat excess discriminators, the values have been smaller than those recommended by WHO(1) (BMI > 30kg.m-2) for this diagnosis(23,34,35).
Hence, the standard cutoff point (%BF = 30%) can explain the reason for higher values established by the ROC curve in comparison to other studies, since the criterion of fat excess adopted in studies with older groups uses higher values of %BF, which reduce the values of anthropometric indicators to keep a suitable sensitivity value for that indicator.
This fact represents that to better identify true obese cases, the BMI cutoff point of > 26.2 kg.m-2 establishes a better relationship with the criterion measurement, however, this value may present a variation if another cutoff point is adopted for fat measurement, which in this study was %BF > 30%. In relation to RPI, it had the cutoff point adjusted to adequate false-positive and false-negative cases.
In any case, such differences did not produce statistically considerable changes in fat excess diagnosis in the sample. This situation may be related to the use of established cutoff points, and the reduced sample size which was not adjusted in the "normal" and "fat excess" groups, contributing to interferences explained here. Therefore, new studies with different cutoff points and with a random sample to identify cutoff points that have a relationship with health risks in elder population are needed.
Another important factor is to determine, in a relational manner with health problems, a cutoff point for the determination of fat excess in older people, so that the comparisons could be performed.
The use of anthropometric indicators (BMI and RPI) presents as main characteristics the easiness of data collection and simplicity in the interpretation of results, which may contribute to control the obesity cases. The practical application of these indicators reflects on the premises that they present a direct relationship with incidence of many chronic and degenerative diseases.
Based on the results, it can be stated, considering the limitations of the use of %BFDEXA as a reference standard method, that women in this study present high prevalence of fat-mass excess, independently of the anthropometric indicator used.
BMI and RPI indicators showed high values of sensitivity. Nonetheless, RPI appeared to be more sensitive than BMI to evaluate the fat-mass excess in women over 50 years of age, when adopting 30% of body fat as reference criterion, to diagnose fat excess.
The area under the ROC curve did not demonstrate significant difference between BMI and RPI indicators for diagnosis of fat excess. The cutoff points of 26.2 kg.m-2 and 39.3 cm.kg-1/3 for BMI and RPI, respectively, presented the best relationship between sensitivity and specificity for the diagnosis of fat-mass excess in this sample of elderly women.
The authors thank the support of the Instituto de Densitometria Óssea de Santa Maria (OSTEOLAB), Santa Maria, RS.
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Edio Luiz Petroski
Universidade Federal de Santa Catarina
Centro de Desportos/Departamento de Educação Física
Campus Universitário, Trindade, Caixa Posta 476
88010-970 Florianópolis, SC
Tel.: (48) 331-8562.
Received in 14/12/04. Final version received in 12/11/05. Approved in 29/11/05.
All the authors
declared there is not any potential conflict of interests regarding this article.
* Universidade Federal de Santa Catarina, Núcleo de Pesquisa em Cineantropometria & Desempenho Humano.