Table 2.

Counts and sample proportions of children with myopia for the different grouping variables which we call risk factors:

Grouping characteristic	Count (Sample proportions)
School	Rural(Small tawn)	Urban (Capital)	Sport(Capital)	Urban (medium sized town)
	28 (8.36%)	43 (31.38%)	16 (8.84%)	149 (19.91%)
Age	6 - 10	11 - 15
	128 (19.93%)	108 (14.22%)
Gender	Male	Female
	103 (13.86%)	133 (20.21%)
Sport	Every day	Not every day
	48 (11.74%)	186 (19.60%)
Screen time	Less than 4 hours	More or equal to 4 hours
	179 (17.92%)	51 (14.87%)
Previous examination	Yes	No
	67 (9.81%)	169 (23.93%)
Parents wear glasses	None of the parents	At least one parent
	113 (13.47%)	114 (23.46%)