Table 1.

Outdoor data of participants with and without myopia (N = 6832)

	median (IQR)#2		P value	mean ± SD#3		P value
	Non-myopia (N = 2000)	Myopia (N = 4832)		Non-myopia (N = 2000)	Myopia (N = 4832)
Weekday outdoor duration, hour#1	0.750(0.750, 1.500)	0.750(0.750, 1.500)	< 0.001*	1.236 ± 0.851	1.143 ± 0.828	< 0.001*
Weekend outdoor duration, hour	2.500(1.500, 2.500)	1.500(1.500, 2.500)	< 0.001*	2.222 ± 1.194	1.855 ± 1.161	< 0.001*
Average outdoor duration, hour	1.250(0.964, 1.821)	1.214(0.893, 1.786)	< 0.001*	1.518 ± 0.801	1.347 ± 0.783	< 0.001*
Weekend catch-up outdoor duration, hour	0.000(0.000, 1.000)	0.000(-1.000, 1.000)	< 0.001*	0.188 ± 1.244	-0.054 ± 1.202	< 0.001*

#1: This was non-normally distributed continuous variable. However, the median (IQR) of myopia group were same to that of non-myopia group, hence the calculation of mean ± SD was added

#2: Data was analyzed using non-parametric test

#3: Data was analyzed using Student’s t-test

*: P < 0.05