Table 2. Cutoff point for criteria A within the six-diagnostic criteria model for smartphone addiction.

Cutoff Point	Diagnostic Accuracy	Sensitivity	Specificity	Positive Predictive Rate	Negative Predictive Rate
1	60.5%	99.0%	40.2%	46.6%	98.7%
2	77.9%	94.9%	69.0%	61.7%	96.2%
3	84.3%	78.4%	87.5%	76.8%	88.5%
4	77.9%	44.3%	95.7%	84.3%	76.5%
5	71.5%	18.6%	99.5%	94.7%	69.9%
6	66.5%	3.1%	100%	100%	66.2%

A cutoff point at three criteria of the six criteria model (A2, A4, A5, A6, A7, A9) performed the optimal diagnostic accuracy (84.3%).