Development of Step-Count Cut Points for School-Day Vigorous Physical Activity

Table 2

Receiver operating characteristic curve step-count cut points across various levels of school-day vigorous physical activity.

VPA cut point	Step-count cut point	Sensitivity	Specificity	Maximum Youden’s Statistic	Accuracy
5 minutes of VPA	3,460	74.0%	74.0%	0.48	74.1%
10 minutes of VPA	4,133	81.0%	77.5%	0.56	77.8%
15 minutes of VPA	4,133	97.0%	74.8%	0.71	75.2%
20 minutes of VPA	5,628	85.7%	95.1%	0.81	95.1%

Note. VPA stands for vigorous physical activity.