Table 2. Interdevice comparison of central corneal thickness measurements.

Pairwise comparison	Mean paired difference		95% CI of mean difference (µm)		Pearson correlation
	1mean±SD (µm)	2P	Lower	Upper	R	3P
OLCR and SD-OCT	4.38±3.79	<0.001	3.30	5.46	0.995	<0.001
OLCR and Scheimpflug-Placido topographer	4.38±6.03	<0.001	2.66	6.09	0.985	<0.001
USP and OLCR	13.20±6.46	<0.001	11.36	15.04	0.985	<0.001
SD-OCT and Scheimpflug-Placido topographer	-0.05±6.77	0.987	-1.93	1.92	0.980	<0.001
USP and SD-OCT	17.59±6.76	<0.001	15.67	19.51	0.985	<0.001
USP and Scheimpflug-Placido topographer	17.58±8.13	<0.001	15.27	19.89	0.977	<0.001

¹Mean interdevice difference; OLCR: Optical low coherence reflectometry; SD-OCT: Spectral-domain optical coherence tomography; USP: Ultrasound pachymetry; ²Repeated-measures ANOVA using Bonferroni adjustment for multiple comparisons; ³Pearson correlation analysis.