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Concordance of obesity classification between body mass index and percent body fat among school children in Saudi Arabia.

Al-Mohaimeed A, Ahmed S, Dandash K, Ismail MS, Saquib N - BMC Pediatr (2015)

Bottom Line: Hence, we compared two field methods for their usefulness in epidemiological studies.Compared to boys, the mean BMI was higher in girls whereas the mean percent body fat was lower (p-values < 0.0001).The agreement rate was low between these two methods (boys = 0.48, girls =0.24).

View Article: PubMed Central - PubMed

Affiliation: Family and Community Medicine Department, College of Medicine, Qassim University, Qassim, Saudi Arabia. armoh@qumed.edu.sa.

ABSTRACT

Background: In Saudi Arabia, where childhood obesity is a major public health issue, it is important to identify the best tool for obesity classification. Hence, we compared two field methods for their usefulness in epidemiological studies.

Methods: The sample consisted of 874 primary school (grade I-IV) children, aged 6-10 years, and was obtained through a multi-stage random sampling procedure. Weight and height were measured, and BMI (kg/m(2)) was calculated. Percent body fat was determined with a Futrex analyzer that uses near infrared reactance (NIR) technology. Method specific cut-off values were used for obesity classification. Sensitivity, specificity, positive and negative predictive values were determined for BMI, and the agreement between BMI and percent body fat was calculated.

Results: Compared to boys, the mean BMI was higher in girls whereas the mean percent body fat was lower (p-values < 0.0001). According to BMI, the prevalence of overweight or obesity was significantly higher in girls (34.3% vs. 17.3%); as oppose to percent body fat, which was similar between the sexes (6.6% vs. 7.0%). The sensitivity of BMI to classify overweight or obesity was high (boys = 93%, girls = 100%); and its false-positive detection rate was also high (boys = 63%, girls = 81%). The agreement rate was low between these two methods (boys = 0.48, girls =0.24).

Conclusions: There is poor agreement in obesity classification between BMI and percent body fat, using NIR method, among Saudi school children.

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Related in: MedlinePlus

Overweight or obesity prevalence among Saudi school children: by body mass index and percent body fat, stratified by sex and age (boys = 2a; girls = 2b).
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Fig2: Overweight or obesity prevalence among Saudi school children: by body mass index and percent body fat, stratified by sex and age (boys = 2a; girls = 2b).

Mentions: In both sexes, the prevalence of overweight/obese was higher using BMI than percent body fat consistently across the age groups (Figure 2a,b). Irrespective of method, for boys overweight/obese prevalence increased incrementally with age; however, in girls, there was no such pattern (Figure 2).Figure 2


Concordance of obesity classification between body mass index and percent body fat among school children in Saudi Arabia.

Al-Mohaimeed A, Ahmed S, Dandash K, Ismail MS, Saquib N - BMC Pediatr (2015)

Overweight or obesity prevalence among Saudi school children: by body mass index and percent body fat, stratified by sex and age (boys = 2a; girls = 2b).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4355549&req=5

Fig2: Overweight or obesity prevalence among Saudi school children: by body mass index and percent body fat, stratified by sex and age (boys = 2a; girls = 2b).
Mentions: In both sexes, the prevalence of overweight/obese was higher using BMI than percent body fat consistently across the age groups (Figure 2a,b). Irrespective of method, for boys overweight/obese prevalence increased incrementally with age; however, in girls, there was no such pattern (Figure 2).Figure 2

Bottom Line: Hence, we compared two field methods for their usefulness in epidemiological studies.Compared to boys, the mean BMI was higher in girls whereas the mean percent body fat was lower (p-values < 0.0001).The agreement rate was low between these two methods (boys = 0.48, girls =0.24).

View Article: PubMed Central - PubMed

Affiliation: Family and Community Medicine Department, College of Medicine, Qassim University, Qassim, Saudi Arabia. armoh@qumed.edu.sa.

ABSTRACT

Background: In Saudi Arabia, where childhood obesity is a major public health issue, it is important to identify the best tool for obesity classification. Hence, we compared two field methods for their usefulness in epidemiological studies.

Methods: The sample consisted of 874 primary school (grade I-IV) children, aged 6-10 years, and was obtained through a multi-stage random sampling procedure. Weight and height were measured, and BMI (kg/m(2)) was calculated. Percent body fat was determined with a Futrex analyzer that uses near infrared reactance (NIR) technology. Method specific cut-off values were used for obesity classification. Sensitivity, specificity, positive and negative predictive values were determined for BMI, and the agreement between BMI and percent body fat was calculated.

Results: Compared to boys, the mean BMI was higher in girls whereas the mean percent body fat was lower (p-values < 0.0001). According to BMI, the prevalence of overweight or obesity was significantly higher in girls (34.3% vs. 17.3%); as oppose to percent body fat, which was similar between the sexes (6.6% vs. 7.0%). The sensitivity of BMI to classify overweight or obesity was high (boys = 93%, girls = 100%); and its false-positive detection rate was also high (boys = 63%, girls = 81%). The agreement rate was low between these two methods (boys = 0.48, girls =0.24).

Conclusions: There is poor agreement in obesity classification between BMI and percent body fat, using NIR method, among Saudi school children.

Show MeSH
Related in: MedlinePlus