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Ciência & Saúde Coletiva

Print version ISSN 1413-8123

Ciênc. saúde coletiva vol.17 n.2 Rio de Janeiro Feb. 2012

http://dx.doi.org/10.1590/S1413-81232012000200016 

FREE THEMES

 

Comparison of eating attitudes among university students from the five Brazilian regions

 

Comparação das Atitudes Alimentares entre universitárias das cinco regiões brasileiras

 

 

Marle dos Santos AlvarengaI; Fernanda Baeza ScagliusiII; Sonia Tucunduva PhilippiI

IDepartamento de Nutrição, Faculdade de Saúde Pública, Universidade de São Paulo (USP). Avenida Doutor Arnaldo 715, Cerqueira César. 01246-904 São Paulo SP. marlealvarenga@gmail.com
IICampus Baixada Santista, Depto de Ciências da Saúde, Universidade Federal de São Paulo

 

 


ABSTRACT

Eating attitudes can be defined as beliefs, thoughts, feelings, behavior and relationship with food. They can influence people's food choices and health status. The scope of this paper is to compare eating attitudes of university students from different regions of Brazil and investigate possible associations and correlations with nutritional status, age, individual income and parental education. 2489 female university students in the area of health answered the Eating Attitude Scale - evaluated by total score and 5 sub-scores. The eating attitudes were compared by means of an analysis of covariance. A logistic regression was conducted to evaluate which variables were associated to the scale score. The Northeast presented more restrictive and compensatory practices and the North and Northeast presented less positive feelings about food and worse ideas about normal eating. The score on the scale did not present strong correlation with any of the variables studied, but nutritional status and age were associated with the total score. The profile of university students was similar among regions with the worst response in the North and Northeast regions. It is believed that these data could help to elucidate dietary patterns and nutritional differences among groups.

Key words: Eating attitudes, Female university students, Nutritional status


RESUMO

Atitudes alimentares são crenças, pensamentos, sentimentos, comportamentos e relacionamento com os alimentos e influenciam as escolhas alimentares e a saúde dos indivíduos. Objetivo: comparar atitudes alimentares de universitárias brasileiras das cinco regiões do país e avaliar associações e correlações com o estado nutricional, curso, idade, renda e escolaridade do chefe da família. Métodos: 2489 universitárias do sexo feminino de cursos da área da saúde responderam à Escala de Atitudes Alimentares - analisada em escore total e suas 5 subescalas. As respostas foram comparadas por região através da análise de covariância. Uma regressão logística foi realizada para avaliar quais variáveis estavam associadas à pontuação da escala. Resultados: a região Nordeste apresentou mais práticas restritivas e compensatórias e as regiões Norte e Nordeste menos sentimentos positivos em relação à alimentação e os piores conceitos sobre alimentação normal. Os escores não apresentaram forte correlação com as variáveis estudadas; mas o estado nutricional e a idade tiveram associação com a pontuação total. Conclusão: As atitudes alimentares de universitárias foram similares entre as regiões, com pior resposta na região Norte e Nordeste. Estes resultados podem ajudar a elucidar padrões dietéticos e diferenças nutricionais entre regiões do país.

Palavras-chave: Atitudes alimentares, Universitárias, Estado nutricional


 

 

Introduction

Eating is vital in life and a major determinant of health; it is thus important to study this subject from its different perspectives. Most studies in eating and nutrition have focused on physiological aspects, but if dissociated from their pertinent social environment is believed to produce only limited knowledge; for that reason, a cultural, psychological and social approach is necessary1. One possibility in this perspective is to study eating aspects besides the eating consumption, even in quantitative studies.

It is thus believed that people develop a relationship with food and the term "eating attitude" seems to better describe it2,3. Considering the general definition of attitude from Oppenheim4 as "long-lasting clusters of feelings, beliefs, and cognitions in general, which may be positive or negative, toward a specific object that lead to actions that are coherent to the cognitions and feeling toward the specific object", Alvarenga et al.5 defined eating attitudes as one's beliefs, thoughts, feelings, behaviors and relationship with food and many studies in this area of knowledge also use the term attitude to describe thoughts, feelings and beliefs regarding eating3,6-9. Therefore, the term eating behavior does not encompass the correct idea of one relationship with food because it does not include the beliefs, thoughts and feelings towards food, while the term "eating attitudes" does.

Alvarenga et al.5 developed and validated the Disordered Eating Attitude Scale (DEAS) based on this understanding of the construct. A suitably developed instrument allows performing food assessments in different groups and populations.

Rozin et al.3 claimed that different attitudes toward food may have an effect on overall health and contribute to differences in non-transmissible diseases. Different eating attitudes, especially regarding pleasure versus health concerns, can have an effect on overall health since pleasure apparently act as health promoters and worries can adversely affect health. It suggests that social and psychological components of eating, included in the concept of eating attitude, may be major health determinants3.

It is believed that food choices would be culturally determined but few studies have so far assessed the difference of attitudes among countries or different regions3,7. Comparing eating attitudes among different environments could provide input for studying the association between attitudes and the prevalence of obesity, eating disorders among others.

The issue of eating attitude has not been consistently discussed in Brazil. Nutritional Brazilian research generally has been investigating different food consumption and epidemiological profiles associated to the prevalence of nutritional diseases10-12. The few studies concerning eating attitudes in Brazil analyzed clinical samples, especially those diagnosed with eating disorders13-15. Nevertheless, a significant increase of obesity rates have been seen in Brazil in all age groups and social strata16 and thus there is a need to better understand the attitudes toward eating and body weight presented by the general population, and not only those diagnosed with eating disorders. Besides that, Brazil is divided into regions which are characterized by diverse local population, type of settlement, weather conditions, and eating habits as well. From a nutritional perspective, little is known besides these regions have distinct prevalence of obesity and malnutrition12, eating habits10 and food availability11. There is no study in Brazil investigating differences of eating attitudes among Brazilian regions. Thus, the study purpose was to compare eating attitudes evaluated by DEAS of female university students from different Brazilian regions and to investigate potential differences, associations and correlations with age, major, nutritional status, income and education of family head.

 

Methods

Subjects

In this assessment, it was opted to focus on eating attitudes of adult females since eating problems seem to be more significant among women1,3,17. Also, the DEAS was validated for the female young population5. A sample of universitary students was defined in order to evaluate young female subjects in a transversal study. The sample size was determined considering and calculations made by OpenEpi software (Dean AG, Sullivan KM & Soe MM, Rollins School of Public Health - Emory University, Atlanta, GA, USA. Updated 2007). The calculations were made considering: a) 80% of power; b) 5% of significance; c) the total population of college women in Brazil, in 2005 - 2.488.92718 and; d) the hypothesized percentual frequency of the outcome factor in this population - 8.3%19. Using these parameters it was verified that the necessary sample by region was 117 subjects.

Actually the truly outcome factor (eating attitudes) was never evaluated in Brazil with this focus. Then the outcome factor used was "eating attitudes" measure by the Eating Attitude Test (EAT-26), a well know and broadly used instrument in this field that was validated for Portuguese20. The outcome found by Feio19 was chosen because it was found in a study with Brazilian university students in a random sample while others performed in Brazil with university students focus on specific majors, such as nutrition or medicine21,22.

In order to achieve the sample a partnership with public and private education institutions was sought. Formal invitations for research partnership were sent through e-mail to 130 higher education institutions that had undergraduate courses in nutrition and were listed in the National Nutrition Board in 2007. Due to geographical and other operational issues, study questionnaires were forwarded to coordinators of nutrition courses at the institutions that agreed to participate. A total of 37 (28.5%) responded and signed the research partnership agreement required. Private and public institutions were invited for this partnership, nonetheless since a voluntary agreement was needed; a proportional distribution between the type of institution by region was not possible. From total, 8 (21.6%) were public and the others private.

Subjects were selected mainly from nursing and psychology courses, which have predominantly female students, when these were not present they were selected from speech therapy, physical therapy, pharmacy and biomedicine as they were available in most institutions. For greater sample consistency, students attending the first and second year were invited to participate. Inclusion criteria were a) being females, b) aged over 18 and under 50 - to have a sample of young adult women c) to sign an informed consent agreeing to participate. Exclusion criteria were a) to be a dietitian or attending undergraduate studies in nutrition, b) being pregnant, c) to inform a health condition that could have an impact in eating attitudes (such as an eating disorder). Dietitians and/or those attending undergraduate studies in nutrition were excluded because studies have showed that nutrition students have different eating behaviors21,23. Physical education students were not invited to participate due to the fact that this area is related to nutrition and body issues.

In average 80 questionnaires were sent to each institution and partners invited students randomly. Overall, 2,925 instruments were sent during the second semester of 2007 and the first semester of 2008, and 2,547 filled instruments were received. The national response rate was 87.1%, and by region it was: 94.1% for North (3 institutions), 95.7% for Northeast (5 institutions), 71.1% for Central West (5 institutions), 85.9% for Southeast (12 institutions) and 89.0% for South (12 institutions). The response rate from Central West region was lower, but it was above than the necessary sample calculated by region.

Some questionnaires were excluded (2.3%) because either information was missing or they were completed by a student who did not meet the inclusion criteria. Two students reported being pregnant and one reported being in treatment for anorexia nervosa and they were all excluded. The final sample included 2,489 university students.

Local coordinators received specific instructions about the DEAS administration. Following the inclusion and exclusion criteria, the questionnaire was then auto completed in the classroom and respondents were required to provide information such as age, self-reported body weight and height, individual income and education of family head. The nutritional status was classified according with Body Mass Index (BMI) categories24.

Instrument

The DEAS was developed based on the eating attitude construct as beliefs, thoughts, feelings, behaviors and relationship with food5. DEAS comprises 25 questions scored based on Likert scale, ranging from 37 to 190. An exploratory factor analysis was conducted and it was found that DEAS includes five subscales, named as: Subscale 1 - Relationship with food: evaluate attitudes related to the ways individuals deal with food in terms of food control, food refusal, guilt, anger, desire and shame; Subscale 2 - Concerns about eating and body weight gain: evaluate concerns about calories, intake control, obsessive thoughts about food and weight gain; Subscale 3 - Restrictive and compensatory practices: evaluate restriction of food and calories, and attitudes aiming to compensate large or uncontrolled food intake; Subscale 4 - Feelings toward eating: evaluate feelings concerning pleasure and food memories and how normal one feels to eat, and Subscale 5 - Idea of normal eating: evaluate rigid nutrition concepts and beliefs. The higher the score in the scale, the worse the attitude; thus, more dysfunctional (e.g. people with higher score at subscale 4 have less positive feelings about eating and don't consider the act of eating as normal as people that scored less).

Cronbach's Alpha was 0.75 indicating that the scale has good internal consistency. The psychometric analysis concluded that the scale is valid and useful for evaluating eating attitudes in different population groups and eating disordered patients5.

Analysis

Statistical analyses were conducted using SPSS 12.0 (Statistical Package for Social Science Inc., Chicago, Illinois USA). The significance level adopted was 0.05. Categorical variables were described as the absolute and relative frequencies and quantitative variables as mean, median, standard deviation and range. Categorical variables were compared using the chi-square test or Fisher's exact test (F).

The total score and the scores obtained by the five subscales of DEAS were compared among regions by means an analysis of variance using as fixed covariables: major, age, nutritional status (BMI categories), individual income and education of family head. The variables age, body weight, height, BMI, individual income and education of family head were also compared among regions. Levene's test for homogeneity of variances was performed. In the event of lack of homogeneity of variances the Brown-Forsythe (BF) test was performed for adjustment. Analysis of variance and post-hoc comparison tests (Bonferroni and Tukey test) were carried out to identify any differences found. In the event of adjustment using BF test, multiple comparisons (two-by-two) with the Dunnett's test were performed to identify differences among the groups.

Correlations coefficients between DEAS total score and its subscales were determined with the fixed covariables (major, age, BMI, individual income and education of family head). Pearson's coefficient was used for quantitative variables and Spearman's coefficient for qualitative ones.

A logistic regression was done to evaluate which variables were associated with the total scale score. The Stepwise forward model was used, that includes in the model just the independent variables with statistical significance (p<0.05), in this case, region, BMI and age.

All students signed a free informed consent form. The study was approved by the Research Ethics Committee of Public Health School - University of São Paulo.

 

Results

Of all, 240 subjects (9.6%) were from the North region; 383 (15.4%) from the Northeast; 199 (8%) from the Central-West; 885 (35.6%) from the Southeast, and 782 from the South (31.42%). There were 1,462 nursing (58.7%); 376 psychology (15.1%), 305 pharmacy (12.3%), 235 physical therapy (9.4%), 44 biomedicine (1.8%), and 32 speech therapy students (1.3%) - information about undergraduate course was missing for 35 (1.4%).

Table 1 shows the distribution of age and BMI by region; statistically significant differences were found among regions, with higher mean values for age and BMI in the North and lower mean values in the Central West (24 years / 22.1 kg/m2 and 20 years / 21.1 kg/m2, respectively). The students were also divided into age groups: 685 (27.5%) were between 18 and 19 years old; 1,054 (42.3%) were between 20 and 24; 685 (27.5%) were over 25 - and 65 (2.6%) did not report age. A significant difference was also seen among regions when these categories of age were considered (p < 0.001) with higher proportion of students over 25 years in the North and higher proportion of students with 18 to 19 years in the Central West.

When nutritional status was assessed using the BMI most subjects were at normal range with differences among regions (Table 1), but when BMI was classified according with all the categories presented by World Health Organization24 there was no statistical difference among regions (data not show). Only when underweight and obesity classes were grouped and normal range and pre obesity were considered, a significant difference was found among regions: a higher proportion of underweight was found in the Central West (14.7%), normal range in the South (77.5%), pre obesity in the North (15.6%), and obesity (class 1,2 and 3) in the South (3.5%).

Per capita monthly income was analyzed based on monthly minimum wages (MMWs), corresponding to R$ 380.00 as of 2007. The majority of subjects reported individual monthly income lower than 2 MMWs and there was a statistical difference among regions, with higher proportion of 2-9.99 MMWs in the South and higher proportion of > 10 MMWs in the Northeast (Table 1). In regard to education of family head, Table 1 shows that most students reported college education (complete or not). There was a statistical difference among regions with higher proportion of lower education in the Southeast and higher proportion of college education in the North.

The overall DEAS score by region and the scores in the five subscales are shown in Table 2. There was a statistical difference among regions in the overall DEAS score and in the Subscales 3, 4 and 5. The analysis of covariance showed that BMI had an effect on the overall DEAS score and this difference remained after adjusting for this variable, with North and Northeast regions presenting higher mean scores.

The analysis of covariance of subscales with a significant difference showed that BMI and age had an effect on Subscale 3 and the difference persisted after adjustment with higher mean scores in Northeast. As for Subscale 4, BMI had an effect on the model and the difference remained among regions with higher mean scores in North and Northeast. As for Subscale 5, the analysis showed that age, BMI and major had an effect on the final model. After adjustments and multiple comparisons, the mean score in the North was higher than in the other regions, followed by the Northeast.

As for the remaining subscales, BMI and age had an effect on Subscale 1 but this difference among regions disappeared after adjustment. Income and BMI had an effect on Subscale 2 but after controlling for these the difference among regions disappeared.

No strong correlation was found between the overall DEAS score and its related subscales and the covariables studied (all them under 30%).

Logistic regression showed that North and Northeast regions students have, respectively, 2.20 and 2.46 the chance of a higher DEAS score than Central West; normal weight range students have 3.67 the chance of a higher DEAS score than underweight students and overweight students 10.6 the chance than underweight ones. It was also found that for each year increased of age, the chance for a higher DEAS total score decreases in 3% [(1-0,97)*100].

 

Discussion

It was found that the profile of this group of Brazilian university students was similar with worse eating attitude in the North and Northeast regions. In all regions, the students were young, mostly (69.8%) between 18 and 24 years of age, normal weight range (74.6%), had a monthly income lower than 2 MMWs (57.1%) and the family head had college education (44.7%). It can be assumed that the differences found in mean ages, BMI, income and education among regions can be attributed to the sample size, which could potentially exacerbate small differences.

This study has the limitation of not use the truly outcome factor (eating attitudes) to determine the sample size. However, given the significant number of students participating and the fact that there are no other similar studies in Brazil, a profile of eating attitudes can be regarded as a starting point for further studies.

The nutritional profile of the sample was similar to that described nationwide for this stage of life. Most students are at normal range, and pre obesity and obesity were less prevalent than among female Brazilian adults, which are around 40% and 13.1%, respectively16. Younger women are likely to have lower rates of excess weight than adults. The National Survey on Demographics of Children and Women (PNDS) showed that 52.4% of women at the age 20 to 24 years are at normal range. The PNDS also evidenced that the prevalence of pre obesity declines as schooling increases25. It should be stressed, however, that weight and height were self-reported in the present study. A meta-analysis26 concluded that self-reported height and weight are good estimates of actual measures. In Brazil, studies27,28 found high consistency between self-reported and measured data and self-reported data are considered reliable when actual measures are not available for epidemiological studies.

As for monthly income, the majority reported a value lower than 2 MMWs. The Brazilian Household Survey (PNAD) reported a mean monthly income of R$956.00 in 2007 (adjusted by the National Consumer Price Index), corresponding to 2.5 MMWs29.

Elitization of the population studied is reflected by the education of family head, which resulted most had college education. PNAD data29 showed that only 8.6% of Brazilian adults over the age of 25 have fifteen or more years of study. The difference in the North and Northeast is even greater when comparing the rate of complete college education in adults found in PNAD (5.7% and 4.9%, respectively) and the proportion of college education of the family head found in the present study (54.1% and 48.7%). Then, considering the education of family head as an indicative of social economic condition, seems that these North and Northeast students could be considered more elitized.

With respect to the eating attitudes, the analysis evidenced higher overall DEAS score in the North and Northeast, even after adjustments in the analysis of covariance. And for those subscales with statistically different scores after adjusting for covariables, the North region had the highest scores for Subscales 4 and 5. Differences in mean scores among regions were very small; and median overall score and subscale scores are quite similar in all regions. Besides that there is no homogeneity in the difference because the overall DEAS score and scores in Subscales 4 and 5 were not always statistically different among the same regions; and the score for Subscale 3 was higher in the Northeast and different from South, Southeast and Central West but not from North. Nevertheless, more inadequate eating attitudes were found in the North and Northeast. It can be thus assumed that those from the Northeast have more restrictive and compensatory practices (assessed by Subscale 3) and those from the North and Northeast have more negative feelings toward eating (Subscale 4). In addition, the most negative concept about normal eating (Subscale 5) was seen in the North, followed by the Northeast.

No strong correlations were found between DEAS scores (overall and subscales) and the variables studied; but besides region, the logistic regression showed that age and BMI were associated with the overall DEAS score, with younger and heavier students presenting more chance for worse eating attitude.

Mean and median DEAS scores suggest that university students in Brazil have very similar eating attitudes despite living in different regions. The differences found in the North and Northeast cannot be explained only by the variables studied. Eating habits, cultural background and lifestyle are known to differ in the five regions but since the proportion of university students is still small in Brazil, they are quite elitized and similar despite living in different areas.

Preliminary data of Vigitel research30 support in some way our result of worse attitudes in the North region. This research, conducted by phone using a probabilistic sample of 54,369 individuals in all Brazilian capitals, found that 13.6% of the individuals were dieting in order to lose weight and that Manaus was the capital with more individuals dieting (17.1%).

The worse attitude in the North region was true for the subscales "feelings toward eating" (Subscale 4) and "idea of normal eating" (Subscale 5) that probably lead to a higher mean total score and consequently the most negative eating attitude (score in the overall DEAS). We could not find an explanation with the variables studied to these results of less feelings related with pleasure and also more rigid nutrition beliefs in students living in this region of the country. It is not possible to explain also the result of more restrictive and compensatory practices in the Northeast region. We are now exploring with this group of students the role of body image, media influence and eating behavior risk in the results of DEAS. Besides media influence and body image satisfaction, cultural background and ethnicity may be associated to the study findings and should be further investigated.

There is a general impression that the concerns and worries regarding diet, food, body and health are higher in more developed cities, as in the central south regions of Brazil. For example, the studies concerning risk behavior for eating disorders (ED) or clinical symptoms were mostly realized in the Southeast and South14,21,31-34, rarely in the Northeast22,35 and as long as we know none in the North region. Therefore the reality regarding these concerns in the North is in fact unknown. Besides the studies based on Pesquisa de Orçamentos Familiares - POF11,36,37 and Vigitel38, we also do not have knowledge of any study that compared food or nutrient intake among regions, especially in the same age group (as university students), thus we do not even know the possible differences in the North and Northeast of the country with regard food intake. There is not any facility center specialized in ED in the North. In conclusion, we do not know possible differences in the prevalence of ED in Brazilian regions and neither about the reality regarding food and body weight worries in the North and Northeast.

Anyway a potential globalization of information about food, diets, perception of the ideal body and concepts on nutrition should be considered as they seem to be widely disseminated in all regions as well in all age groups and socioeconomic strata. Another consideration involves the ethnic and cultural diversity of the Brazilian population but differences in race and ancestry were not explored in this study. Brazil was colonized by immigrants coming from different parts of the world; Europeans have settled mostly in the South and Southeast, Africans in the Northeast, while most of the native population remained in the North. However, due to similar age and socioeconomic condition, university students could likely have access to the same information and also to be subjected to the same socially accepted standards of eating and body as well. People in all Brazilian regions are widely exposed to the same movies, magazines, TV programs, fads and laws, especially in large urban areas where they have access to the same media. These facts could explain the result of any difference found for subscales 1 and 2 among regions.

To fully understand these differences, maybe a qualitative study will be necessary. Anyway, for the main objective of the present study (to compare eating attitudes of universitary students from 5 regions) a quantitative study was more appropriate - since we did not intend to analyze the influence of culture in the eating attitudes. Probably to understand how this relationship with food happens and developed and how the culture of each region interacts with these attitudes (to form a web of meanings), qualitative studies are needed, and it could be a future direction for research.

Rozin et al.17 investigated eating attitudes of 2,300 American college students from six different regions in the United States and "surprisingly" did not find major differences. They found no difference associated to either race or social condition, and the most important predictor was gender: women were more concerned with eating, weight and health. This pattern could probably be found in the present study if men were included.

DEAS questions are not the same used in the study of Rozin et al.17 but, for the sake of comparison, the DEAS question "I dream of a pill that could replace food" is close to the question "If I could eliminate eating by satisfying nutritional needs safely, cheaply and without hunger, with a pill, I would" 17. They found that 34% of female American students agreed with this statement. In contrast, 14% of Brazilians said that they always, very often or often dream of having a pill to replace food. We believe that the wording "I dream of" has a stronger impact than the possibility of replacing food "if it would be safe, cheap and without hunger (...)". The dream of having a pill to replace meals has a stronger correlation with eating refusal.

Likewise, the DEAS question "Do you have pleasure eating?" is comparable to the question "Enjoying food is one of the most important pleasures in my life" from the American study17. In this study, 58% of women agreed with this statement while 95.7% of Brazilian women said they have pleasure eating. However, if the question were "one of the most important pleasures," the answers would likely be different.

It would be relevant to explore whether female (as well as male) adults in general - not only university students - would provide similar answers nationwide. Since a proportional distribution of private and public institutions was not possible for this sample - and a different socioeconomic profile could be found in these two publics - further studies should explore these groups. In addition to studying capitals and larger cities (where most universities are located), potential differences in eating attitudes between urban and rural populations and those living in capital and country cities should also be investigated. Further studies should be conducted to assess eating attitudes of both female and male, adolescents and adults from different locations and to compare their eating attitudes with those of people worldwide.

In conclusion, Brazilian university students have quite similar eating attitudes. Overall, the most inadequate eating attitudes, the most negative feelings toward eating and the most rigid concepts about normal eating were seen in the North and Northeast regions; the most restrictive and compensatory practices in the Northeast. It was also concluded that - besides region - BMI and age were associated with eating attitudes (DEAS total score).

It is believed that eating attitudes could help elucidating dietary patterns and nutritional differences among groups, then the DEAS could aggregate social and psychological values to the study of food practices and choices since it is not limited to the eating intake but otherwise to feelings, beliefs, thoughts and relationship with food. Nonetheless, there is much research to be done broadening the knowledge in which food relationship functions - especially about the development of the young female pattern of relations to food - but also much to be learned about how and why eating attitudes and food choices are determined. Qualitative studies should be useful and must be performed in order to elucidate these issues.

 

Collaborations

MS Alvarenga was responsible for the research; FB Scagliusi was a research collaborator; ST Philippi was the supervisor of the pos doctorate program in which this research was included. All contributed for the analysis and discussion of the results and content composition. The authors reviewed the final versions and approved it.

 

Acknowledgments

The authors would like to thank The State of Sao Paulo Research Foundation - FAPESP for the grant that supported this research, and to thank the significant colaboration of nutrition courses coordinators in the data collection at institutions which participated in the research.

 

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Artigo apresentado em 08/03/2010
Aprovado em 16/07/2010
Versão final apresentada em 09/08/2010