Table 5.

P values of differences in contrast acuity between all different subgroups of NOSPECS in TAO group.

Groups	Frequency
	A	B	C	D	E
O	.181	.727	.684	.695	.446
S	.377	.984	.212	.969	.908
P	.338	.593	.546	.157	.250
E	.055	.885	.923	.674	.962
C	.916	.575	.640	.213	.959

TAO: thyroid associated ophthalmopathy.

NOSPECS classification was described in Section 2.

Letters indicate different spatial frequencies in FACT: 1.5 (A), 3 (B), 6 (C), 12 (D), and 18 (E) cycles per degree.