Table 3.

Area under ROC curve (AUC), optimal cut-off values, sensitivities, specificities and Youden index of anthropometric indices in predicting high blood pressure according to sex in group B

Body composition indices	AUC (95% CI)	P value	Cut-off value	Sensitivity (%) (95% CI)	Specificity (%) (95% CI)	Youden index	χ²*	P value*
Total (n=513)
BMI-for-age z-score	0.793 (0.750 to 0.836)	<0.001	0.79	71.1 (0.633 to 0.778)	76.6 (0.717 to 0.808)	0.477	1.45	0.228
WC percentile	0.781 (0.737 to 0.825)	<0.001	73.0	66.0 (0.581 to 0.732)	80.2 (0.756 to 0.842)	0.462	0.00	0.993
WHtR	0.781 (0.736 to 0.826)	<0.001	0.44	74.2 (0.666 to 0.807)	71.5 (0.664 to 0.761)	0.457	–	–
ABSI	0.688 (0.637 to 0.739)	<0.001	0.14	57.2 (0.491 to 0.650)	74.3 (0.691 to 0.784)	0.315	27.71	<0.001
Males (n=211)
BMI-for-age z-score	0.808 (0.744 to 0.872)	<0.001	0.79	79.7 (0.674 to 0.883)	70.7 (0.626 to 0.778)	0.504	0.51	0.475
WC percentile	0.788 (0.720 to 0.857)	<0.001	72.0	70.3 (0.574 to 0.808)	78.9 (0.713 to 0.850)	0.492	0.62	0.430
WHtR	0.799 (0.732 to 0.865)	<0.001	0.46	70.3 (0.574 to 0.808)	80.3 (0.727 to 0.862)	0.506	–	–
ABSI	0.730 (0.650 to 0.809)	<0.001	0.14	70.3 (0.574 to 0.808)	72.1 (0.640 to 0.790)	0.424	8.82	0.003
Females (n=302)
BMI-for-age z-score	0.786 (0.729 to 0.843)	<0.001	0.92	63.2 (0.526 to 0.726)	84.5 (0.787 to 0.890)	0.477	1.86	0.172
WC percentile	0.777 (0.719 to 0.835)	<0.001	70.0	63.2 (0.526 to 0.726)	81.2 (0.750 to 0.861)	0.443	0.52	0.471
WHtR	0.768 (0.708 to 0.828)	<0.001	0.45	71.6 (0.613 to 0.801)	72.9 (0.663 to 0.788)	0.445	–	–
ABSI	0.665 (0.598 to 0.731)	<0.001	0.14	54.7 (0.442 to0.649)	70.0 (0.632 to 0.761)	0.248	16.70	<0.001

*Comparison of the AUC value of WHtR with the other anthropometric indices.

ABSI, a body shape index; AUC, area under the curve; BMI, body mass index; ROC, receiver operating characteristic; WC, waist circumference; WHtR, waist-to-height ratio.