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Table 4 Test-retest intraclass correlation coefficients – repeatability limits of agreement

From: Introduction of a digital near-vision reading test for normal and low vision adults: development and validation

Parameter NVG LVG Total
ICC 95% CI LoA ICC 95% CI LoA ICC 95% CI LoA
RA 0.914 [0.901, 0.928] [−0.163, 0.174] 0.928 [0.905, 0.947] [−0.134, 0.196] 0.922 [0.897, 0.941] [−0.151, 0.165]
MRS 0.956 [0.944, 0.971] [−91.565, 43.947] 0.943 [0.914, 0.968] [−87.599, 39.762] 0.944 [0.913, 0.972] [−89.548, 41.857]
CPS 0.909 [0.889, 0.931] [−0.394, 0.234] 0.903 [0.881, 0.928] [−0.318, 0.188] 0.912 [0.887, 0.931] [−0.349, 0.199]
ACC 0.927 [0.898, 0.949] [−0.455, 0.380] 0.926 [0.885, 0.961] [−0.258, 0.146] 0.928 [0.911, 0.953] [−0.398, 0.311]
  1. [ICCs: two-way mixed, average measures, absolute agreement]
  2. ACC = reading accessibility index; CI = confidence interval; CPS = critical print size; ICC = intraclass correlation coefficient; LVG = low vision group; MRS = maximum reading speed; NVG = normal vision group; RA = reading acuity