Table 6

Estimates of the effect of each study factor on the odds of non-certification

Study factor		Western Eye Hospital (n=129)				Moorfields Eye Hospital II (n=194)
Study factor		Crude OR (95% CI)	Adj OR (95% CI)			Crude OR (95% CI)	Adj OR (95% CI)
Severity of VI:
Blind	1	1		1	1
P sight	4.9 (2.2, 10.8)	4.2 (1.9, 9.6)		2.9 (1.5, 5.5)	3.4 (1.7, 6.8)
Cert on field alone:
No	1	1		1	1
Yes	1.3 (0.6, 3.0)	1.7 (0.7, 4.3)		4.2 (1.3, 13.0)	3.6 (1.0, 12.7)
Sex:
Women	1	1		1	1
Men	0.7 (0.3, 1.5)	0.8 (0.3, 1.8)		1.4 (0.8, 2.5)	1.6 (0.8, 2.9)
Age (years):
⩽64	1	1		1	1
65–74	1.2 (0.4, 3.5)	1.2 (0.4, 3.8)		2.1 (0.9, 4.5)	1.6 (0.7, 3.7)
75–84	1.5 (0.6, 4.2)	1.4 (0.5, 4.3)		2.8 (1.4, 5.6)	2.4 (1.1, 5.2)
85–94	1 (0.3, 2.9)	0.8 (0.2, 2.7)		3.1 (1.0, 9.1)	4.1 (1.2, 13.2)
No of previous hospital visits:
⩽3	1	1		1	1
4–10	0.8 (0.2, 2.5)	0.9 (0.2, 3.4)		0.5 (0.2, 1.2)	0.4 (0.1, 1.2)
11–40	0.9 (0.3, 3.3)	1.2 (0.3, 4.8)		0.4 (0.1, 0.9)	0.2 (0.1, 0.7)
>40	0.3 (0.1, 1.1)	0.4 (0.1, 1.6)		0.2 (0.1, 0.4)	0.1 (0.0, 0.3)
Main diagnosis:
I	1	1		1	1
II	1.3 (0.6, 2.8)	1.3 (0.6, 3.0)		2.1 (1.1, 4.0)	2.7 (1.4, 5.3)
III	10.2 (2.2, 47.9)	8.2 (1.7, 39.9)		7.9 (2.2, 28.3)	8.3 (2.2, 31.4)

↵Adj ORs = adjusted for severity of visual impairment and main diagnosis.
↵I = permanent and no ongoing treatment; II = permanent but ongoing treatment; III = potentially reversible.