Table 2.

Identified zone at the time of diagnosis according to categories of severity of ROP

	ZONE
	I		II		III		TOTAL
	n	%	n	%	n	%	n
non RT 1	5	6.0%	41	48.8%	38	45.2%	84
Immature Retina	1	2.1%	16	33.3%	31	64.6%	48
Mild ROP	0	0.0%	22	75.9%	7	24.1%	29
Type 2 ROP	4	57.1%	3	42.9%	–	–	7
RT 1	3	7.9%	35	92.1%	0	0.0%	38
Type 1 ROP	2	5.6%	34	94.4%	–	–	36
Advanced ROP	1	50.0%	1	50.0%	–	–	2
All	8	6.6%	76	62.3%	38	31.1%	122

¹ RT: requiring treatment