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Table 3 Bland-Altman analysis and paired t-test showing the agreement between the FAZA measurement after correction with ALact against both FAZA measurement after correction with ALest and uncorrected FAZA

From: Correcting magnification error in foveal avascular zone area measurements of optical coherence tomography angiography images with estimated axial length

Parameters Mean diff. (mm) (95% CI) SD (mm) Lower LoA Upper LoA tstat (df) P value ICC (95% CI)
FAZA corrected with ALest vs. FAZA corrected with ALact 0.002 (− 0.002, 0.007) 0.015  − 0.027 (− 0.034, − 0.019) 0.031 (0.024, 0.039) 1.090 (45) 0.072 0.992 (0.985, 0.995)
FAZA uncorrected vs. FAZA corrected with ALact  − 0.005 (− 0.014, 0.004) 0.030 − 0.064 (− 0.080, − 0.049) 0.054 (0.039, 0.069) − 1.639 (45) 0.072 0.965 (0.937, 0.980)
  1. ALact = actual axial length; ALest = estimated axial length; CI = confidence interval; df = degrees of freedom; FAZA = foveal avascular zone area; ICC = intraclass coefficient; LoA = limits of agreement; SD = standard deviation; tstat = t-statistic