Table 2. Association between hours spent on DD and CVS symptoms.

DD= digital devices. CVS= computer vision syndrome. SE= standard error.

	Do not have CVS				Have CVS*
Number of hours	Count	SE	Row N%	SE	Count	SE	Row N%	SE	P value**
<1	0	.	0.0%	.	5	2	100%	.
1-<2	2	1	12.5%	8.3%	14	4	87.5%	8.3%	<0.001
2-<3	3	2	14.3%	7.6%	18	4	85.7%	7.6%	<0.001
3-<4	7	3	13.5%	4.7%	45	6	86.5%	4.7%	<0.001
4-<6	9	3	11.8%	3.7%	67	7	88.2%	3.7%	<0.001
≥6	13	4	6.1%	1.6%	199	10	93.9%	1.6%	<0.001