Table 2.

Fishman Grade: qAF and Texture Factor

Fishman Grade	Eyes/Subjects, n	Age, y	Duration, y	qAF, qAF Units	Texture Factor, qAF Units0.5
I	34/24	33 ± 14*	10 ± 8	458 ± 12*	2.5 ± 0.7*
II	20/12	21 ± 10*	6 ± 7	684 ± 109*	3.7 ± 1.2*†
III	10/6	28 ± 8	9 ± 5	538 ± 94	5.6 ± 1.8†

Mean ± SD. Same symbols (*, †) in each column indicated significant differences (P < 0.001), accounting for two eyes in some subjects and for family relationships.