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Table 2 Bland-Altman analysis and paired t-test showing agreement between estimated and actual axial length

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 (95% CI) Upper LoA (95% CI) tstat (df) P value R2 ICC (95% CI)
Validation dataset (post-cycloplegic SE) 0.012 (− 0.025, 0.049) 0.486 − 0.940 (− 1.005, − 0.877) 0.965 (0.901, 1.029) 0.632 (649) 0.527 0.710 0.831 (0.806, 0.921)
Validation dataset (non-cycloplegic SE) 0.095 (0.055, 0.135) 0.519 − 0.922 (− 0.990, − 0.854) 1.113 (1.044, 1.181) 4.683 (650)  < 0.005 0.670 0.802 (0.769, 0.830)
OCTA test dataset (non-cycloplegic SE) 0.029 (− 0.154, 0.212) 0.616 − 1.179 (− 1.494, − 0.864) 1.236 (0.921, 1.551) 0.439 (45) 0.755 0.800 0.892 (0.812, 0.939)
  1. CI = confidence interval; df = degrees of freedom; ICC = intraclass coefficient; LoA = limits of agreement; OCTA = optical coherence tomography angiography; SE = spherical equivalent; SD = standard deviation; tstat = t-statistic