Table 2. Near work and outdoor activity among children with or without myopia.

Variables	Total	Myopia	No myopia	P-valuea
Daily hours of reading or studying for school assignments	1.9 (0.6)	2.1 (0.5)	1.8 (0.6)	<0.001
Daily hours of reading for pleasure	1.2 (0.8)	1.2 (0.8)	1.1 (0.8)	0.007
Weekly hours of watching television	2.8 (0.8)	2.9 (0.8)	2.6 (0.9)	<0.001
Weekly hours of using computer hours	2.8 (1.1)	2.9 (0.9)	2.6 (1.2)	<0.001
Weekly hours of playing electronics	3.5 (1.0)	3.8 (1.2)	3.2 (1.1)	<0.001
Distance of reading (cm)	24.9 (4.1)	24.3 (3.7)	25.4 (4.4)	<0.001
Distance of watching television (m)	3.3 (1.1)	3.2 (1.1)	3.3 (1.1)	0.012
Daily hours of outdoor activity	2.0 (0.9)	2.0 (0.9)	2.1 (0.9)	0.051

Abbreviation: IQR, interquartile range.

^aWilcoxon rank-sum test comparing myopia group with no myopia group.

Data are presented as median (IQR).

Wilcoxon testing was used because of the non-normal distribution of variables.