Table 2.

Distribution of causes of bilateral visual impairment by age and sex.

	Causes of bilateral visual impairment					p-value
	Refractive error			Cornea opacities
	No.	Prevalence (%)		No.	Prevalence (%)
Age group			0.043			0.84
<20	37	4.24 (3.09–5.59)		1	0.11 (0.00–0.07)
20–29	59	2.53 (1.20–3.25)		3	0.13 (0.04–0.38)
30–39	6	2.54 (1.17–5.43)		–	–
Sex			0.24			0.82
Male	57	2.69 (2.08–3.47)		3	0.14 (0.05–0.42)
Female	45	3.42 (2.56–4.54)		1	0.08 (0.01–0.43)

p-value: level of significance reported from Fishers χ² analysis.