Evaluation of Pachymetric Measurements with Scheimpflug Photography-Based System and Optical Coherence Tomography Pachymetry at Different Stages of Keratoconus

Table 3

Degree of correlation between measurements of two devices at different stages of the keratoconus.

Measurement localizations	Stage 1		Stage 2		Stage 3		Stage 4		Total
	ICC (𝑟)	%95 CI	ICC (𝑟)	%95 CI	ICC (𝑟)	%95 CI	ICC (𝑟)	%95 CI	ICC (𝑟)	%95 CI
TCT	0,953**	0,930–0,968	0,914**	0,855–0,949	0,921**	0,547–0,989	0,751**	0,363–0,917	0,946**	0,927–0,960
CCT	0,944**	0,916–0,962	0,876**	0,794–0,926	0,915**	0,518–0,988	0,881**	0,656–0,962	0,942**	0,922–0,957
CT 3 mm	0,939**	0,910–0,959	0,910**	0,849–0,947	0,866**	0,866–0,997	0,791**	0,446–0,931	0,936**	0,914–0,953
CT 5 mm	0,910**	0,868–0,939	0,935**	0,890–0,962	0,977**	0,849–0,997	0,900**	0,706–0,968	0,915**	0,887–0,937
CT 8 mm	0,903**	0,858–0,935	0,866**	0,778–0,920	0,831**	0,204–0,974	0,731**	0,325–0,909	0,903**	0,871–0,928

ICC: intraclass correlation coefficient, CI: confidence interval, ^∗∗𝑃<0.01 CCT: central corneal thickness, TCT: thinnest corneal thickness, CT 3 mm: corneal thickness at 3 mm, CT 5 mm: corneal thickness at 5 mm, and CT 8 mm: corneal thickness at 8 mm.