The comparison of obesity differences in BMI screening among male college students with different body shapes LU Sen-zhao
(Department of Physical Education,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China) Abstract: This study aims to compare the accuracy and difference of BMI screening for obesity among male college students with different shapes. Cross-sectional data of 1596 male college students in first and third grades from a university in Jiangsu were randomly selected, and the obesity screening performance of BMI was diagnosed according to the gold standard of male body fat rate ≥ 25%. The results showed that: (1) the overall detection rate of male obesity defined by BMI was 6.77%, while the detection rate of obesity defined by body fat rate was 12.59%, with a difference rate of 46.23%; (2) compared with the group with BMI ≥ 24kg/m2 overweight detection rate, the authentic evaluation and profit evaluation obtained in reality were all lower; compared with the short group and short-fat group, the tall group and the high-fat group in the test of body fat rate and the definition of obesity had lower sensitivity and higher specificity; (3) the area under the curve and the sensitivity obtained by ROC curve analysis showed that the tall and tall-obese people were lower; (4) there is certain body composition confusion information in BMI. The conclusions were that: (1) the accuracy of BMI in the diagnosis of obesity in male college students is limited, and all male students and male students in every group are much looser than the "gold standard" of body fat rate screening for obesity. (2) The detection rate of BMI obesity of different body shapes is obviously unbalanced, especially for tall and tall-obese people the error is usually greater and generally higher. (3) When using BMI to diagnose obesity, in addition to factors such as gender, age, and race, it is recommended that body shape should also be included in the differential influencing factors for further consideration. Key words: body mass index;body fat rate;obesity diagnosis;body shape;male college students