Table 3.

Comparison of Agreement Between Diagnostic Modalities

Testing Modality	Mean Difference, μm (SE)	Limits of Agreement	% Outside LOA	P value*
AS-OCT - Pentacam	16.37 (−34.41 to 67.14)	−206.72 to 239.45	4.76	0.01
AS-OCT - USP	−76.42 (−128.45 to −24.40)	−292.27 to 139.42	5.26	0.88
USP - Pentacam	97.77 (35.08 to 160.46)	−162.37 to 357.91	5.26	0.18

Paired comparisons of remaining microns of cornea in area of maximal corneal thinning for AS-OCT, Pentacam, and USP. Abbreviations: SE, Standard Error of the measurement; LOA, Limits of Agreement; AS-OCT, Anterior Segment Optical Coherence Tomography; USP, Ultrasonic Pachymetry

^*Pitman’s test of difference in variance