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Arquivos Brasileiros de Cardiologia

Print version ISSN 0066-782XOn-line version ISSN 1678-4170

Arq. Bras. Cardiol. vol.79 no.1 São Paulo July 2002

http://dx.doi.org/10.1590/S0066-782X2002001000007 

Original Article


 

Body Mass Index: A Scientific Evidence-Based Inquiry

 

Djalma Rabelo Ricardo, Claudio Gil Soares de Araújo

Rio de Janeiro, RJ - Brazil

 

 

OBJECTVE: To objectively and critically assess body mass index and to propose alternatives for relating body weight and height that are evidence-based and that eliminate or reduce the limitations of the body mass index.
METHODS
: To analyze the relations involving weight and height, we used 2 databases as follows: 1) children and adolescents from Brazil, the United States, and Switzerland; and 2) 538 university students. We performed mathematical simulations with height data ranging from 115 to 190 cm and weight data ranging from 25 to 105 kg. We selected 3 methods to analyze the relation of weight and height as follows: body mass index - weight (kg)/height (m2); reciprocal of the ponderal index - height (cm)/weight1/3 (kg); and ectomorphy. Using the normal range from 20 to 25 kg/m2 for the body mass index in the reference height of 170 cm, we identified the corresponding ranges of 41 to 44 cm/kg1/3 for the reciprocal of the ponderal index, and of 1.45 to 3.60 for ectomorphy.
RESULTS:
The mathematical simulations showed a strong association among the 3 methods with an absolute concordance to a height of 170 cm, but with a tendency towards discrepancy in the normal ranges, which had already been observed for the heights of 165 and 175 cm. This made the direct convertibility between the indices unfeasible. The reciprocal of the ponderal index and ectomorphy with their cut points comprised a larger age range in children and adolescents and a wider and more central range in the university students, both for the reported (current) and desired weights.
CONCLUSION:
The reciprocal of the ponderal index and ectomorphy are stronger and are more mathematically logical than body mass index; in addition, they may be applied with the same cut points for normal from the age of 5
½ years on.

Key words: body mass index, ectomorphy, reciprocal of the ponderal index

 

 

The human body has linear, area, and volume measurements. A tendency towards a natural proportionality in body measures exists, and it varies with sex and the growth and developmental degrees 1. According to allometry, height and body weight are, respectively, measures of the linear and volume nature of an organism 2. These 2 anthropometric variables, whose measures are simple and reliable, have been classically used to morphologically characterize an individual. In the XIX century, Quételet proposed a strategy to mathematically relate an individual's weight and height. According to a MEDLINE search, this strategy, which was later named body mass index 3, has appeared in more than 6,000 articles since 1994, and it has scientific and epidemiological consistency. Different authors and international agencies 4-7 have proposed normal ranges for the body mass index of adults, which allow the identification of undernourished, overweight, and obese individuals. The normal values in adolescents, children, and infants, however, are distinct and based on percentiles 8-11.

Recently, the prevalence of overweight and obesity has increased in all countries worldwide; in the United States, the proportion of obese adults practically doubled, increasing from 12.8% between 1960-1962 to 22.5% between 1988-199412. According to IBGE (Brazilian Institute of Geography and Statistics) data 13, in Brazil, the number of obese males increased from 4.5 to 7% between the years 1989 and 1997, showing that this is a problem not only in developed countries, but also in developing ones.

Overweight has been associated historically with chronic and degenerative diseases, such as ischemic heart disease 7,14-16, systemic arterial hypertension 17,18, dyslipidemia 19,20, chronic obstructive pulmonary disease 21, gallbladder disease 22, diabetes mellitus 19, and some types of cancer 23-28. Elevated values of body mass index have been associated with high rates of morbidity and mortality 7,15,29-32.

Even though body mass index has been widely used in clinical practice, several theoretical restrictions to its use and its recommended normal ranges exist. Sexual and ethnic differences, and differences in the patterns of regular physical activity 33-36, and consequently, in the level of adiposity, may contribute to some limitations of the body mass index. It is even possible that the passage of time, stressed by biological and even cultural factors, may interfere with the consistency of the body mass index. An example may be seen in the anthropometric data of famous women, such as female models 37 or those participating in the Miss America Beauty Pageant 38. Even though these women may socially be considered acceptable, a high prevalence of patterns corresponding to clinical undernourishment would be observed if the current criteria for body mass index were applied.

Therefore, it seems appropriate to critically review the use of the body mass index, especially in children and adolescents, and, if possible, to propose alternatives that provide simplicity associated with a greater mathematical and theoretical coherence.

The objective of this study was to compare 3 methods of presenting the weight and height relations for children, adolescents, and adults, assessing their consistency and mathematical formulation. We also aimed at identifying the respective normal ranges, determining in a satisfactory manner the individuals who fit those spectra of linearity considered normal. Our study comprised 3 independent studies designed to analyze the results obtained from the weight and height relations in different populations.

 

Methods

We selected the following 3 procedures to analyze the body weight/height relation: 1) the body mass index, in which the weight/height relation is mathematically defined by the following equation: weight (kg)/height2 (m); 2) the reciprocal of the ponderal index, also known as Sheldon's index 39, which is calculated using the following equation: height (cm)/weight1/3 (kg). According to the allometric model, the latter relation has a stronger mathematical foundation, because weight is a variable of cubic dimensions and height is a variable of linear dimensions 40; 3) the ectomorphy, the third component of the somatotype, represents the relative linearity of the individual 41. In the 1960s, the anthropologist Barbara Heath and the Physical Education professor John E. Lindsay Carter 42 proposed, based on the previous studies by Parnell, the Heath-Carter anthropometric somatotyping method to determine the somatotype. And even more important, they recognized the limitations inherent in the closed numerical scale, which had been originally proposed by Sheldon, and those authors began to accept an unlimited and open scale in only one direction. Later, Araújo 43 stressed the theoretical inconsistency of the method of open scales in only one direction and showed with actual examples of obese individuals its practical limitations, especially in regard to ectomorphy. Therefore, occasional negative values obtained with the formulae of the components became accepted and no longer arbitrarily transformed into 0.1.

The scale for measuring ectomorphy is nondimensional and of a continuous and intervallic nature. In practice, ectomorphy is determined on the basis of the reciprocal of the ponderal index using the linear equation: ectomorphy = [2.42 x ((height (cm)/2.54)/(weight (kg)/0.4536)1/3) – 28.58]. It is worth noting that the units were converted to cm and kg 2,40. Even though the reciprocal of the ponderal index and ectomorphy represent basically the same information, ectomorphy is more frequently used and is one of the components of the somatotype, which is a very frequently used kinanthropometry technique. It allows a more global analysis of the body composition and physique of the individual when analyzed along with the 2 other components, endomorphy and mesomorphy.

The cut points were divided into 3 categories for all the selected methods: underweight, normal weight, and overweight (tab. I).

 

 

For body mass index, we used the limits recommended by the International Obesity Task Force (IOTF) 4. Even though that institution considers as underweight a body mass index below 18.5 kg/m2, we chose a higher cut point as reported by Wang et al 6. Therefore, we considered values below 20 kg/m2 as underweight, because no consensus in regard to lower cut points exists among the institutions and the specialists in the area. To define the cut points and the normal range for the reciprocal of the ponderal index and ectomorphy, we used the respective equivalent values of the normal body mass indices for a height of 170 cm. We had already validated the referred cut points for the reciprocal of the ponderal index and ectomorphy in another population, and concluded that the discrimination power of both was similar to that originally proposed for the body mass index 44.

In study 1, we analyzed the weight/height relations in children and adolescents with ages ranging from 2 to 12 years in 3 different countries (Brazil, the United States, and Switzerland). Data regarding Brazil were collected in the cross-sectional study by Marcondes et al 45, who assessed 9,258 children (4,603 boys and 4,655 girls) in the city of Santo André, in the state of São Paulo. These children belonged to a social class considered normal in regard to life conditions and from the nutritional point of view. Data on these children were grouped in tables with 5 columns, and the middle column corresponded to the medium value. To make the 3 databases uniform, we considered this medium value equivalent to the median value, ie, the 50th percentile.

The values of weight and height regarding the population sample of the United States were collected in a publication of the National Center for Health Statistics (NCHS) 46 with a total of 20,000 individuals of both sexes and ages ranging from 2 to 18 years during the period from 1963 to 1975.

We also analyzed the anthropometric data from the northwestern region of Switzerland (Basel) found in a study of 4,300 individuals with an equal proportion of sexes, and ages ranging from 2 to 17 years, carried out from 1956 to 1957 46. In our study, we only used data relating to the age bracket from 2 to 12 years, minimizing the occasional influences of processes of biological maturation with distinct rhythms.

Once data were arranged in a table, we established the cut points - underweight, normal weight, and overweight - proposed for each method (body mass index, reciprocal of the ponderal index, and ectomorphy). If the methods applied equally well for the analysis of the weight/height ratio of children and adolescents of both sexes and all ages, the individuals in the 50th percentile for weight and height would be within the normal range.

To check the consistency of the indicators to foretell the normal range in adults, which comprised study 2, we performed a mathematical simulation using data of heights between 115 and 190 cm (at every 5 cm) and of weights between 25 and 105 kg (at every 2.5 kg). This way, we obtained a total of 528 weight/height ratios for each of the 3 methods. In addition, data for 3 different heights were separated - 145, 160, and 170 cm - in the following body weight ranges: between 25 and 60 kg, between 40 and 85 kg, and between 45 and 90 kg, respectively. The height 145 cm was chosen because, according to Marcondes (1978), it represents the approximate value of a Brazilian peripuberal adolescent. The remaining heights selected, 160 and 170 cm, represent, respectively, a typical Brazilian female and male 13. We also determined the linear regressions between the body mass index and ectomorphy for the 3 above-mentioned heights in at least 10 distinct body weights.

In the composition of study 3, we used data of the heights and current and desired weights of 538 (331 females and 207 males) students of the Universidade Gama Filho 47, and calculated the weight/height ratios according to the 3 methods selected. After that, we demarcated the normal ranges for the predictors of weight/height relations according to previous studies.

The individuals were arranged in percentiles (from the 1st to the 99th) from the lightest individual to the heaviest individual according to the results of the weight/height ratios. We could assess the strength of each method according to the number of individuals within the normal range.

In a subsequent analysis, we checked the validity of the methods to estimate the normal range for body weight in relation to height, independent of sex, comparing the weight/height relations reported by the interviewees using the desired body weight.

In this specific study, we performed a descriptive analysis of the scores, and we used the Pearson linear correlation coefficient to assess the degree of association between the indicators.

 

Results

Study 1 – Analyzing the weight/height relations in children, we observed that none of the methods studied (body mass index, reciprocal of the ponderal index, and ectomorphy) had a satisfactory consistency to safely identify the normal ranges for the age bracket from 2 to 5½ years in the 3 databases assessed. However, from that age to 12 years, the reciprocal of the ponderal index and ectomorphy almost correctly identified children in the 50th percentiles for height and weight in both sexes. We could also observe that the body mass index did not reflect the relative linearity for any age or sex in this population when the 50th percentile was considered for weight and height. This can be seen in tables II and III in which the normal range is represented as a gray background.

 

 

 

 

Study 2 - The mathematical simulations performed in the 2nd study showed that the 3 methods used to analyze the weight/height relation are strongly associated (r > 0.97; P<0.001), especially when limited weight and height ranges are considered with an absolute coincidence at the height of 170 cm. However, we observed a tendency towards discrepancy in the normal ranges in the 3 methods, and this tendency could already be observed for the height values of 165 and 175 cm (not shown in the table), and it was even more marked in extreme height values, such as 145 cm (tab. IV).

 

 

Even though a strong association exists among the 3 methods in relating weight and height, the coefficients of regression tend to be distinct, because the predictive equations diverge in regard to the constant and the correlation coefficient (coefficient X), therefore, hindering the direct convertibility between the methods. This fact may be seen in the simulations of height (145, 160, and 170 cm), in which we observed that the linear equation of prediction proposed for a certain height could not be used for another height, as shown in table V.

 

 

For example, the ectomorphy of a 160-cm-tall individual weighing 50 kg would be 3.21. On the other hand, if we used the proposed equation for the height of 170 cm, a mistake would occur in that prediction, as exemplified below: BMI = - 2.168. X + 28.3 (where X = ECTO); BMI = - 2.168. 3.21 + 28.3, where the body mass index (predicted through the equation) = 21.34 kg/m2 and the actual body mass index = 19.53 [(weight (kg)/height2 (m)].

Study 3 – The 2 predictors of the weight/height relation presented in this study found a greater number of individuals within the normal range proposed for the referred methods when the weights and heights reported by the university students were considered. This phenomenon could be better observed when the results of the weight/height relations were transformed into percentiles, where the reciprocal of the ponderal index and the ectomorphy discriminated from the 30th to the 90th percentiles and from the 20th to the 95th percentiles for males and females, respectively. This was different from the finding when we used body mass index, in which the normal range encompassed only from the 5th to the 65th percentiles and from the 30th to the 85th percentiles, respectively for university males and females. The reciprocal of the ponderal index and the ectomorphy encompassed a more central and wider range for the university students of both sexes than the body mass index did (tabs. VI and VII).

 

 

 

 

For an index considered ideal by the university students, ie, the desired weight (the amount the individual would like to weigh) and the reported height (current), data strengthen even more the validity of the measures and the normal ranges of the reciprocal of the ponderal index and of ectomorphy as compared with body mass index, once again encompassing a wider and more central range of the sample. Another interesting fact was the asymmetry found in the desired body mass index for males and females, which ranged from lower values in males to higher values in females. These results enabled a crossed validation of the indicators here studied, because the desired indices represent the linearity that the university students would like to have, ie, an ideal weight for a certain height. In this specific case, the reciprocal of the ponderal index and ectomorphy showed a greater discriminating power than that of body mass index.

As suggested by the mathematical simulation in study 2, the relation among body mass index, the ectomorphy, and the reciprocal of the ponderal index (r = -0.89; P<0.001), despite its significance, has lower correlation coefficients, showing that, even though for the fixed height of 170 cm that relation is almost perfect, for real data in which height varies, a significant loss occurs in the association.

 

Discussion

Obesity in childhood is a public health problem, whose importance has progressively increased in the last few years 8,9,29,48. Evidence suggests that the chance of an obese child or adolescent becoming an obese adult is approximately 30% 49. On the other hand, obesity in adulthood is associated with chronic and degenerative diseases, morbidity, and mortality 14,50. However, estimation of the prevalence of obesity in childhood with a safe, reliable, and valid indicator using criteria similar to those used for adults had not yet been possible.

The methods used to diagnose overweight and obesity, and to determine the normal ranges and underweight in this population are numerous. The skinfold measure, mainly the triceps skinfold measure, has been largely used to estimate overweight and obesity in children and adolescents 49,51 with a high association with the direct measures of adiposity, especially between the ages of 10 and 15 years 52. Its application, however, is limited, because it requires highly experienced evaluators, and also because of the existence of the recognized intra- and interevaluator variability of the measures 53. Other anthropometric measures have also been used, among which we can highlight the following: the circumference, relative weight, weight for age, somatotype, and finally the weight and height relations, among which we stress body mass index.

The results of study 1 confirm the unfeasibility of the application of the normality criteria of the body mass index used for adults as an indicator of overweight and obesity for children, because it did not reflect the relative linearity of that population. In contrast, the reciprocal of the ponderal index and the ectomorphy using normal ranges derived from the body mass index for the standard height of 170 cm could identify individuals in a spectrum of linearity considered normal (50th percentile of weight and height) independent of sex and between the ages of 5.5 and 12 years in 3 databases of different regions of the planet. The only exception to this rule was observed at one single age in the database of the Swiss children, probably related to the influence of the early pubescent growth spurt in part of the sample or to another unidentified sample characteristic. This showed a greater independence of these predictors in regard to the intervening variables, which are inherent in the weight and height relations, such as age, sexual maturation, ethnicity, sexual dimorphism, and height itself.

Height has a relevant influence on the estimation of obesity by these indicators 34,54,55, drastically interfering with their results, mainly in children, in whom they remain in constant change up to adulthood, in addition to having a strict correlation with body weight 56. Based on this assumption, a valid and reliable indicator that may safely reflect overweight and obesity in addition to expressing the proper linearity for a child should have a high correlation with body weight, but a minimum association with height 57,58. Unfortunately, this statement does not apply to body mass index, because, according to Garn et al 59, body mass index had a strong relation to height in children (r=0.30) when an expressive number was considered (n=40,000). Garn 60 confirmed the influence of height on body mass index and even added that the divisor of the equation (weight/height2) was originally squared in an attempt to correct this fact. Bellizzi and Dietz 34, reported that even though body mass index had a high correlation with the measures of body density, it was not a perfect indicator for children due to its association with height. Therefore, we infer that body mass index should only be used with criteria adequate for this age bracket.

Another important question relates to the mathematical foundation of body mass index originally proposed by the Belgian astronomer and mathematician Lamber Adolphe Jacques Quételet (1769-1874) 40, according to whom, that index would be provided by dividing weight (kg) by height squared. According to allometry, 2 variables grow at different rates, both in structure and function. In this model, mass has a volumetric proportion, and, therefore, should be cubed; height, on the other hand, has a linear dimension and should be raised to the power of 1 2,40. Both the reciprocal of the ponderal index and the ectomorphy respect this relation of dimension; therefore, they have a better mathematical logic from the biological system point of view.

Therefore, the reciprocal of the ponderal index and ectomorphy have greater accuracy and strength for identifying those individuals who fit a normal standard of weight for a certain height. This is observed only from the age of 5.5 years on, because none of the methods relating weight and height managed to reflect the adequate linearity for the age between 2 and 5.5 years. This may be due to a question related to the complex disproportion of the child as compared with the adult.

A relevant fact to be discussed, specifically in study 1, regards the cut points proposed for the different methods for estimating the nutritional status of a child or adolescent, and upon which the international scientific community has not yet agreed 9,51,34. Recently, Cole et al 10 have proposed for children and adolescents a cut point for body mass index in percentiles based on the cut points used for 18-year-old adults (25 and 30 kg/m2, respectively for overweight and obesity). In most studies considering body mass index in children and adolescents, the percentile is the measure of dispersion most used to classify the individuals, a percentile >85 being used to identify overweight and a percentile >95 to indicate obesity 61,62. However, these cut points are arbitrary 8, because we consider that 5 and 15% of the population are, respectively, obese and overweight; sometimes, these numbers do not represent the sample universe 52.

Nevertheless, we need strategies that may be used to compare the different existing databases and that may serve as a reference for comparisons between the linearity found in children and that of the parents. Body mass index seems not to serve this finality, but the reciprocal of the ponderal index and the ectomorphy allow that, from the age of 5.5 years on, the same cut points of adults may be used regardless of the sex.

In adults, we observed that the results of study 2 confirmed those of the study by Lee et al 58 who reported that the weight and height relations strongly correlate with height for values below 150 cm and above 190 cm. These relations interfered in a relevant manner with the results of those indicators, even though those authors did not analyze the reciprocal of the ponderal index and ectomorphy. This confirmed the discrepancy found in the correlation coefficients and in the constant of the linear equations, when, in the 3 methods adopted, height separated out at 170 cm.

The results found in study 3 showed that the reciprocal of the ponderal index and ectomorphy were stronger than body mass index in university students because those indices identified a greater range of normal-weight individuals in a given height both for the reported and desired weight and height relations. The cut points proposed for body mass index should be reviewed for an adult population, because, as observed in the database analyzed, this method indicated that 35% of the male university students were overweight and, therefore, would be at a higher risk for morbidity and mortality. This seems not to correspond to reality, because, according to data reported by the IBGE 13, Brazil has 22% of overweight males in a wider range of age and socioeconomic conditions.

The limitations of body mass index as an instrument for identifying overweight and obesity in children, adolescents, adults, and the elderly are widely documented. Chart I briefly shows some relevant factors that interfere with the validity of body mass index.

 

 

The present study confirms some previous criticisms in regard to body mass index and proposes other strategies to assess the relative linearity and the nutritional status in distinct phases of life. The reciprocal of the ponderal index and ectomorphy also have limitations inherent in the indices that relate weight and height. They, however, were stronger and had a better mathematical foundation, in addition to having more adequate cut points, allowing, therefore, greater control upon some intervening variables.

In conclusion, based on our data, we confirm the limitations of body mass index, not only because it does not reflect body composition, but it also has intrinsic mathematical limitations that become more evident in the extremities of the height scale. Even though widely used in clinical practice and in studies of epidemiological characteristics, body mass index should be cautiously used even as an instrument of obesity and overweight screening, especially in children and adolescents, in whom other cut points are mandatory.

The reciprocal of the ponderal index and ectomorphy have better mathematical logic and greater consistency. Therefore, they undergo a smaller influence of extreme height data, and can be applied to adults and children older than 5 years and of both sexes. Likewise, the recommended cut points for the normal ranges of these methods are valid for a university population, especially when the desired and not the current body weights are considered, suggesting a potentially consistent clinical application.

Finally, it is possible that with the simple height and weight measures and consequent use of the reciprocal ponderal index or ectomorphy, the latter for those who work with somatotyping, we will be able to detect overweight and obesity in childhood earlier. Better still, we may be able to relate data of children with those of their parents, using the same and single normal range. Further prospective studies are required to confirm or deny the validity of this attractive proposal.

 

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Universidade Gama Filho and Clinimex - Clínica de Medicina do Exercício
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