Table 5.

Area under the curve and cut-off values for parameters

Symptoms	Cut-off value	AUC	P*
Screen time without break
Headache	35 min	0.569	0.001
Eye pain	80 min	0.545	0.045
Screen time per day
Headache	3 h	0.585	<0.001
Foreign body sensation	4 h	0.571	0.003
Watering	4 h	0.549	0.030
Eye pain	4 h	0.550	0.027
Eye fatigue	5 h	0.607	<0.001
Eye redness	5 h	0.607	<0.001

*A ROC analysis ; AUC: area under the curve