Table 2 Summary of age when follow up commenced with respect to follow up criteria.

Criteria for follow up	Age follow up commenced (months)
	(N = number of departments)
	1.5 to <6	6–12	>12 to 36	Ill defined
Preterm	4	1	1	1
BW	12	22	2	1
GA	13	20	2	1
Any ROP	13	11	0	3
Stage 3 ROP	30	12	1	8
Treated ROP	35	9	1	8
Categories combined (earliest age)	49	24	3	5