TY - JOUR
T1 - Classification of obesity varies between body mass index and direct measures of body fat in boys and girls of Asian and European ancestry
AU - McConnell-Nzunga, J.
AU - Naylor, P. J.
AU - Macdonald, H.
AU - Rhodes, R. E.
AU - Hofer, S. M.
AU - McKay, H.
N1 - Publisher Copyright:
© 2017 Taylor & Francis.
PY - 2018/4/3
Y1 - 2018/4/3
N2 - Body mass index is a common proxy for proportion of body fat. However, body mass index may not classify youth similarly across ages and ethnicities. We used sex- and ethnic-specific receiver operating characteristic curves to determine how obesity classifications compared between body mass index and dual energy x-ray absorptiometry-based body fat percent. Male and female participants 9- to 18-years-old (n = 944; 487 female) were measured 1 to 13 times (1999–2012; 4,411 observations). Body mass index identified < 50% of those classified as obese from body fat percent. Specificity was 99.7%, and sensitivity was 35.8%. Using area under the curve and standard error values, body mass index performed significantly better for: Male versus female at 10 years, Asian versus European female except at 13-, 15-, and 16-years-old, Asian female versus male except at 10- and 15-years-old, and for European male versus female, 9- to 11-years-old (p <.05). Our findings provide evidence that users of body mass index should use caution when comparing body mass index across age, sex, and ethnicity.
AB - Body mass index is a common proxy for proportion of body fat. However, body mass index may not classify youth similarly across ages and ethnicities. We used sex- and ethnic-specific receiver operating characteristic curves to determine how obesity classifications compared between body mass index and dual energy x-ray absorptiometry-based body fat percent. Male and female participants 9- to 18-years-old (n = 944; 487 female) were measured 1 to 13 times (1999–2012; 4,411 observations). Body mass index identified < 50% of those classified as obese from body fat percent. Specificity was 99.7%, and sensitivity was 35.8%. Using area under the curve and standard error values, body mass index performed significantly better for: Male versus female at 10 years, Asian versus European female except at 13-, 15-, and 16-years-old, Asian female versus male except at 10- and 15-years-old, and for European male versus female, 9- to 11-years-old (p <.05). Our findings provide evidence that users of body mass index should use caution when comparing body mass index across age, sex, and ethnicity.
KW - BMI
KW - body fat
KW - ethnicity
KW - measurement
KW - obesity
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U2 - 10.1080/1091367X.2017.1405809
DO - 10.1080/1091367X.2017.1405809
M3 - Article
AN - SCOPUS:85038390905
SN - 1091-367X
VL - 22
SP - 154
EP - 166
JO - Measurement in Physical Education and Exercise Science
JF - Measurement in Physical Education and Exercise Science
IS - 2
ER -