Obesity prevalence and trends of PBF related to age were defined on a sample of 8100 people among whom, 4955 were male (Age = 31.2 ± 10 yr) and 3145 were female (Age = 32.1 ± 11.3 yr). Body structure measurements were performed using a standardized method of multichannel bioimpedance analysis (BIA), using a body structure analyzer -InBody 720. The total sample was divided into two subsamples according to sex, where every subsample was divided into five different age groups.The mean PBF values of the Male total sample were 18.2 ± 8.0 % and the female total sample was 28.3 ± 9.2 %. Results of Kruskal-Wallis ANOVA with Dwass-Steel-Critchlow-Fligner post-hock showed that there are statistically significant differences (p < 0.001) between all age groups among themselves except groups 50 -60 and 60 -65 (p = 0.09). Analysis of obesity prevalence according to the PBF indicator in different age groups revealed the existence of statistically significant (p < 0.001) trends of increasing obesity with age, both in men and women. Based on the result of this study, it can be concluded that most of the Serbian working population are in the range of normal PBF values, excluding the male 30-39.9 yr and female 60-65 yr age categories as groups which are more prone to obesity levels.
The aim of this paper is to determine the agreement in assessing the nutritional status of adolescents using the classification systems of the US Centers for Disease Control and Prevention (CDC), the International Obesity Task Force (IOTF) and the World Health Organization (WHO). Non-experimental observation was performed on a sample of 213 first grade high school students from Banja Luka, Republika Srpska, Bosnia and Herzegovina, with an average age of 15.67 years, of which 89 (41.8%) were male and 124 female (58.2%). Each of the subjects was categorized according to a unique scale, as underweight, normal weight, overweight or obese, using IOTF, CDC and WHO reference values. The Cohen kappa coefficient (k) was used to estimate the agreement of the three classification systems in determining nutritional status. The prevalence of underweight was found to be highest according to IOTF standards in both sexes, while the prevalence of overweight was highest according to WHO references. The differences between analyzed three systems are not large for the obese category, especially in girls. In boys, CDC references show a slightly higher percentage of obese compared to the other two systems. The agreement between the classification systems ranges from 0.83 to 0.86 on the total sample of respondents based on all nutritional status categories, which can be considered a reliable parameter for further monitoring, comparison and prescribing of measures.
The goal of this study was to define the population parameters of the body fat percentage of residents of the Republic of Serbia. The sample was a total of 8145 respondents, of which 3051 (37.5%) were women with an average age of 32.0 ± 9.8 years, and the rest of 5094 (62.5%) were men with an average age of 32.9 ± 11.3 years. The average value of PBF for the women subsample was 28.46 ± 9.19% and 18.00 ± 7.98% for the men subsample. The results of factorial variance analysis have shown that there is a statistically significant difference (p<0.001) of PBF values regarding sex (F=1243.719) and respondent's age (F=508.469) as well as the interaction of factors "age" and "sex" (F=22.593). The regression analysis has shown that age explains 82.09% of variance regarding the age function for women and 85.08% of variance regarding the age function for men, taking into consideration that the function that best describes the variance PBF for women is linear and polynomial for men. Both sex and age are determined as factors that influence over-increasing the values of PBF, while the most critical groups where PBF crosses critical values are the groups of women over 50 years of age (the average prevalence of overweight and obese is 37.81% and 23.89% respectively) and men over 60 years of age (the average prevalence of overweight and obese is 25.48% and 38.36% respectively).
The primary goal of this paper was to examine the attitudes of primary school students towards different aspects of physical education, with special emphasis on the specifics of age and gender categories. Also, the emotional relation towards physical education was examined through its ranking on the list of favorite subjects, and it was brought in connection with attitudes. The sample consisted of 6627 students (boys 3341 - 50.4%; girls 3286 - 49.6%) of primary schools in the city of Banja Luka (Republic of Srpska, Bosnia and Herzegovina), of which 2201 elementary school students and 4426 middle school students. Using t-tests, it was found that elementary school students in relation to the middle school students show statistically significantly higher values for the general attitude towards physical education. A comprehensive approach to the analysis of 15 separate items showed that the former express significantly higher values for most items. Girls and boys do not differ in terms of a general attitude towards physical education. Elementary school students ranked physical education better than other subjects, while girls of both age categories ranked physical education somewhat worse than boys. Better attitudes and ranking by younger students indicate the priority of this phase of life for physical education and the need to raise quality in working with this age. Declining values at an older age (middle school) require more proactive teacher action with an emphasis on the implementation of interesting content. The lack of differences between the attitudes of girls and boys calls for a renunciation of the traditional assumption that only boys have a benevolent attitude towards physical education. This implies greater support for girls and their stronger involvement in all organizational forms of physical education (sports sections, school competitions).
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