Table 3 Analysis of likelihood of ascertaining children with blindness and severe visual impairment in Bangladesh in 2001: comparison of case ascertainment by the key informant method with recruitment through specialised schools for blind children (n = 1639).

	Univariate analysis OR (CI)	Adjusted for age and gender OR (CI)	p Value
Age group
11–15	1 (1)	1 (1)
6–10	1.5 (1.2 to 1.9)	1.5 (1.2 to 2.0)*	0.001
0–5	13.8 (6.7 to 28.3)	14.1 (6.9 to 28.9)*	<0.001
Gender
Boys	1 (1)	1 (1)
Girls	1.6 (1.2 to 2.0)	1.6 (1.3 to 2.1)†	<0.001
Dwelling
Urban	1 (1)	1 (1)
Rural	6.1 (3.8 to 9.8)	5.9 (3.6 to 9.7)	<0.001
Visual acuity
Blind	1 (1)	1 (1)
SVI	2.1 (1.3 to 3.5)	2.5 (1.4 to 4.2)	<0.001
Additional impairment
No	1 (1)	1 (1)
Yes	3.4 (1.6 to 7.4)	3.1 (1.4 to 7.0)	0.005
Onset of visual loss
Congenital	1 (1)	1 (1)
Infantile‡	2.6 (1.8 to 3.8)	2.5 (1.7 to 3.7)	<0.001
⩾1 year to <5 years	1.0 (0.8 to 1.4)	1.2 (0.9 to 1.6)	0.220
⩾5 years	1.1 (0.8 to 1.5)	1.6 (1.2 to 2.3)	0.004
Cause: lens
Non‐lens	1 (1)	1 (1)
Lens	1.2 (1.1 to 1.3)	1.2 (1.1 to 1.3)	<0.001
Cause: cornea
Non‐cornea	1 (1)	1 (1)
Cornea	0.9 (0.8 to 1.0)	1.0 (0.8 to 1.1)	0.448
Preventable
No	1 (1)	1 (1)
Yes	0.7 (0.5 to 0.9)	0.8 (0.6 to 1.0)	0.09
Treatable
No	1 (1)	1 (1)	1
Yes	1.3 (1.2 to 1.5)	1.3 (1.1 to 1.4)	<0.001
Avoidable
No	1 (1)	1 (1)	1
Yes	1.3 (1 to 1.6)	1.4 (1.1 to 1.7)	0.015

*Sex adjusted; †age adjusted; ‡postnatal to <1 year of age.

SVI, severe visual impairment.