Table 1

Tumour related risk factors

Variable	No	No	Yes	p Value	RR
Right eye	227	158	69	NS	1.4
Left eye	208	161	47		1
Tumour site
Anterior	33	19	14	<0.0001	3.1
Involving equator	186	117	69		3.01
Posterior	215	182	33		1
Tumour site (posterior)
No	220	137	83	<0.0001	3.01
Yes	215	182	33		1
Tumour diameter
⩽ 12 mm	247	210	37	<0.0001	1
>12 mm	188	109	79		3.7
Tumour height
⩽ 5 mm	229	207	22	<0.0001	1
>5 mm	206	112	94		6.2
Tumour volume
⩽ 0.4 cm³	233	212	21	<0.0001	1
0.4–1.00 cm³	115	67	48		5.8
>1 cm³	86	39	47		10.2
Retinal detachment
No	333	260	73	<0.0001	1
Yes	102	59	43		2.2