Table 3

Pearson's correlation coefficients between asthenopia, environmental discomfort, and other variables

Variables	1	2	3	4	5
1 Hours/day at VDT	—
2 Years at VDT	0.15
3 Age	0.12	0.40^3-160
4 Sex	0.07	0.04	0.04		—
5 Environmental discomfort	0.12	0.06	0.14	0.09	—
6 Asthenopia	0.18	0.05	0.45^3-160	0.35^3-160	0.23^3-150

↵3-150 p<0.05;
↵3-160 p<0.01 two tailed.