Table 1.

Average ROP grouped by history of stroke and gender.

	without history of stroke	with history of stroke	overall
overall	52.71%	48.25%	51.61%
sample number	301	99	400
male	49.91%	44.25%	48.19%
sample number	164	71	235
female	56.09%	58.42%	56.48%
sample number	137	28	165