Table 3.

Sensitivity, specificity, and Kappa statistics for cardiorespiratory cut-offs and overweight/obesity in different anthropometric indices, stratified by gender.

Boys	Body-mass index (kg/m2; ≥85th percentile denotes overweight/obesity)
VO2max (mlO2/kg/min)	Normal*	Overweight/obesity	Chi-square test	Value of p	Kappa statistics	Value of p
≥44.6 mlO2/kg/min	90.8%	36.7%
<44.6 mlO2/kg/min	9.2%	63.3%	177.8	<0.001	0.50	<0.001
Girls
VO2max (mlO2/kg/min)
≥41.0 mlO2/kg/min	80.2%	21.4%
<41.0 mlO2/kg/min	19.8%	78.6%	163.5	<0.001	0.42	<0.001
Boys	Waist circumference (cm; ≥85th percentile denotes overweight/obesity)
VO2max (mlO2/kg/min)	Normal	Overweight/obesity	Chi-square test	Value of p	Kappa statistics	Value of p
≥46.4 mlO2/kg/min	89.5%	44.8%
<46.4 mlO2/kg/min	10.5%	55.2%	118.5	<0.001	0.41	<0.001
Girls
VO2max (mlO2/kg/min)
≥40.8 mlO2/kg/min	79.2%	25.2%
<40.8 mlO2/kg/min	20.8%	74.8%	128.2	<0.001	0.37	<0.001
Boys	Waist-to-height ratio (≥0.5 denotes overweight/obesity)
VO2max (mlO2/kg/min)	Normal	Overweight/obesity	Chi-square test	Value of p	Kappa statistics	Value of p
≥46.9 mlO2/kg/min	91.4%	31.2%
<46.9 mlO2/kg/min	8.6%	68.8%	209.3	<0.001	0.55	<0.001
Girls
VO2max (mlO2/kg/min)
≥40.7 mlO2/kg/min	77.4%	17.1%
<40.7 mlO2/kg/min	22.6%	82.9%	114.3	<0.001	0.31	<0.001

^*denotes using percentages (%).