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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