Table 1.

Birth weight, gestational age and postmentrual age at the time of diagnosis or presentation according to categories of severity of ROP

	Prematures		BW (g) (CI 95%) [range]	GA (CI 95%) [range]	1st Ev2 (CI 95%) [range]	PMA (CI 95%) [range]	Last Ev2 (CI 95%) [range]	No Ev2 (CI 95%) [range]
	n	%
non RT 1	94	71.2%	1707 ± 121	33w 2d ± 0w 4d	37w 3d ± 0w 5d	38w 4d ± 0w 5d	43w 6d ± 1w 2d	3.62 ± 0.65
			[630, 4700]	[27w 0d, 42w 0d]	[31w 0d, 51w 0d]	[33w 0d, 50w 6d]	[35w 0d, 71w 0d]	[1, 15]
Mature Retina	10	7.6%	2331 ± 553	36w 2d ± 1w 2d	40w 5d ± 1w 6d	40w 5d ± 1w 6d	40w 5d ± 1w 6d	1.00 ± 0
			[1720, 4700]	[32w 0d, 40w 0d]	[34w 6d, 44w 2d]	[34w 6d, 44w 2d]	[34w 6d, 44w 2d]	[1]
Immature Retina	48	36.4%	1801 ± 151	33w 5d ± 0w 5d	38w 2d ± 1w 0d	38w 2d ± 1w 0d	41w 6d ± 1w 3d	2.23 ± 0.48
			[1010, 3600]	[28w 0d, 42w 0d]	[32w 0d, 51w 0d]	[33w 0d, 50w 6d]	[35w 0d, 56w 0d]	[1, 9]
Mild ROP	29	22.0%	1433 ± 141	31w 6d ± 0w 6d	35w 5d ± 1w 2d	38w 4d ± 1w 2d	47w 6d ± 2w 4d	6.31 ± 1.27
			[630, 2560]	[27w 0d, 36w 0d]	[31w 0d, 50w 0d]	[33w 4d, 49w 5d]	[38w 0d, 71w 0d]	[1, 15]
Type 2 ROP	7	5.3%	1304 ± 278	31w 0d ± 0w 5d	34w 5d ± 1w 3d	37w 0d ± 3w 0d	45w 3d ± 6w 1d	5.71 ± 2.52
			[950, 1830]	[29w 0d, 32w 0d]	[31w 0d, 37w 0d]	[33w 5d, 45w 4d]	[35w 0d, 55w 0d]	[2, 12]
RT 1	38	28.8%	1316 ± 110	30w 4d ± 0w 5d	35w 1d ± 0w 6d	37w 3d ± 0w 5d	47w 3d ± 2w 3d	8.84 ± 1.13
			[830, 2220]	[26w 0d, 35w 0d]	[29w 0d, 40w 0d]	[31w 1d, 42w 1d]	[33w 0d, 66w 0d]	[3, 16]
Type 1 ROP	36	27.3%	1310 ± 112	30w 4d ± 0w 5d	34w 6d ± 0w 5d	37w 2d ± 0w 5d	46w 4d ± 2w 1d	8.91 ± 1.13
			[830, 2220]	[26w 0d, 35w 0d]	[29w 0d, 40w 0d]	[31w 1d, 42w 1d]	[33w 0d, 66w 0d]	[3, 16]
Advanced ROP	2	1.5%	1425 ± 735	29w 3d ± 4w 6 d	39w 1d ± 1w 6d	39w 1d ± 1w 6d	63w 0d ± 5w 6d	5.00 ± 1.96
			[1050, 1800]	[27w 0d, 32w 0d]	[38w 0d, 40w 0d]	[38w 2d, 40w 1d]	[60w 0d, 66w 0d]	[4, 6]

¹ RT: requiring treatment

² Ev: evaluation