Table 1.

Prevalence of bilateral and unilateral visual impairment by age and sex.

	Study popln.	Bilateral visual impairment			Unilateral visual impairment
	No.	No.	Prevalence (%) (95% CI)	Odds ratio (95% CI)	No.	Prevalence (%) (95% CI)	Odds ratio (95% CI)
Age group
<20	872	38	4.36 (3.19–5.92)	1.00	4	0.46 (0.18–1.17)	1.00
20–29	2329	62	2.66 (2.08–3.40)	0.59 (0.39–0.90)*	21	0.90 (0.59–1.37)	1.77 (0.59–5.25)
30–39	236	6	2.54 (1.17–5.43)	0.57 (0.24–1.38)	2	0.85 (0.23–3.04)	1.66 (0.30–9.19)
Gender
Male	2120	61	2.88 (2.25–3.68)	0.90 (0.60–1.35)	20	0.94 (0.61–1.45)	1.62 (0.67–3.90)
Female	1317	45	3.42 (2.56–4.54)	1.00	7	0.53 (0.26–1.09)	1.00

^*p < 0.05; population (popln.).