Table 1. Descriptive statistics for central corneal thickness (in µm) measurements.

Methods	Mean±SD	Min	Max	95% CI
OLCR	530.30±35.62	451	607	520.17-540.42
SD-OCT	525.90±34.08	451	599	516.22-535.60
Scheimpflug-Placido topographer	525.92±34.10	453	595	516.22-535.61
USP	543.50±37.11	466	625	532.95-554.05

CI: Confidence interval; OLCR: Optical low coherence reflectometry; SD-OCT: Spectral-domain optical coherence tomography; USP: Ultrasound pachymetry.