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

BMC Pediatrics

Nazmus Saquib¹  Mohammed Saleh Ismail⁴  Khadiga Dandash²  Saifuddin Ahmed³  Abdulrahman Al-Mohaimeed² 

[1] College of Medicine, Sulaiman AlRajhi Colleges, Al Bukairyah 51941, Kingdom of Saudi Arabia, Al-Qassim, Saudi Arabia;Family and Community Medicine Department, College of Medicine, Qassim University, Qassim, Saudi Arabia;Department of Population, Family and Reproductive Health and Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA;Food Science & Human Nutrition Department, College of Agriculture and Veterinary, Qassim University, Qassim, Saudi Arabia

关键词: NIR;    Near infrared reactance;    Obesity;    Saudi Arabia;    Percent body fat;    BMI;    Body mass index;    Anthropometry;    Children;   

Others  :  1139927
DOI  :  10.1186/s12887-015-0335-6

 received in 2014-02-03, accepted in 2015-02-13,  发布年份 2015

【 摘 要 】

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/m²) 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.

【 授权许可】

   
2015 Al-Mohaimeed et al.; licensee BioMed Central.

【 图 表 】

Figure 1.

Figure 2.

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