Table 1. Repeatability of 13-LGS photoreceptor density measurements in fully manual photoreceptor identification compared to semi-automated correction.
| Observer 1 | Observer 2 | Observer 3 | Observer 4 | Observer 5 | ||
|---|---|---|---|---|---|---|
| Manual | Repeatability Coefficient#,* (95% CI) |
25.92 (24.06–27.77) |
61.99 (57.56–66.42) |
75.08 (69.72–80.45) |
45.36 (42.11–48.60) |
39.03 (36.24–41.82) |
| Measurement Error^,* | 18.34 | 43.86 | 53.13 | 32.09 | 27.61 | |
| Semi-Auto | Repeatability Coefficient#,* (95% CI) |
15.58 (14.46–16.69) |
18.01 (16.72–19.29) |
28.03 (26.03–30.03) |
59.09 (54.87–63.31) |
15.94 (14.80–17.08) |
| Measurement Error^,* | 11.02 | 12.74 | 19.83 | 41.81 | 11.28 |
*Density values in cells/degrees2
#The difference between two measurements by that observer for the same image is expected to be less than this for 95% of paired observations.
^The difference between a measurement and the true value is expected to be less than this for 95% of observations.