Table 4.

The recurrence rates of ROP in each GA subgroup of two groups

GA (wk)	conventional-dose group	high-dose group	X2	p-value
25 ~ 28	9 (30.00)	2 (7.69)	4.391	0.047
29 ~ 31	10 (27.78)	2 (6.45)	5.153	0.028
32 ~ 34	6 (10.53)	0 (0)	4.488	0.041
35 ~ 36	1 (4.35)	0 (0)	0.599	1.000