. Author manuscript; available in PMC: 2010 Feb 1.

Published in final edited form as: Ophthalmology. 2008 Dec 16;116(2):332–339. doi: 10.1016/j.ophtha.2008.09.035

Table 1.

Percentage of eyes with astigmatism and high astigmatism at 6 and 9 months corrected age and at 2 and 3 years postnatal age.

Refractive status		Treatment at high-risk prethreshold n/N^* (%)	Conventionally-managed high-risk eyes
Refractive status		Treatment at high-risk prethreshold n/N^* (%)	Total conventionall y-managed high-risk eyes n/N^* (%)	Treatment at threshold n/N (%)	Regressed no treatment n/N (%)
Astigmatism greater than or equal to 1.00 Diopters	6 months	92/283 (32.5%)	87/272 (32.0%)	49/172 (28.5%)	37/99 (37.4%)
	9 months	117/304 (38.5%)	113/280 (40.4%)	66/172 (38.4%)	47/107 (43.9%)
	2 years	107/281 (38.1%)	93/253 (36.8%)	59/155 (38.1%)	34/98 (34.7%)
	3 years	116/268 (43.3%)	99/244 (40.6%)	65/150 (43.3%)	33/93 (35.5%)
Astigmatism greater than or equal to 2.00 Diopters	6 months	26/283 (9.2%)	30/272 (11.0%)	16/172 (9.3%)	14/99 (14.1%)
	9 months	41/304 (13.5%)	44/280 (15.7%)	28/172 (16.3%)	16/107 (15.0%)
	2 years	45/281 (16.0%)	31/253 (12.3%)	22/155 (14.2%)	9/98 (9.2%)
	3 years	53/268 (19.8%)	31/244 (12.7%)	23/150 (15.3%)	8/93 (8.6%)

See Results Section for early treatment (ET) and conventional management (CM) eyes with unavailable refractive error data.