Table 1.

Summary of Mean Differences between Two Observers, Limits of Agreement, Correlation Coefficient, and Coefficient of Reproducibility for Interobserver Variability

Area	Mean CV 1 (mm3)	Mean CV 2 (mm3)	SE (mm3)	Difference between Means (mm3)	95% Limit of Agreement* (mm3)	CCC	CR (mm3)	95% CI (mm3)
Average	8.74	8.63	0.007	+0.0232	−0.4 to +0.44	0.9956	0.42	0.34–0.5
Central ring	0.29	0.28	0.0006	+0.0007	−0.024 to +0.025	0.9880	0.024	0.02–0.03
Inner ring	2.04	2.045	0.0003	+0.0038	−0.107 to +0.11	0.9953	0.11	0.09–0.13
Outer ring	6.8	6.37	0.027	−0.019	−0.42 to +0.38	0.9923	0.4	0.32–0.47

CR, coefficient of reproducibility; Mean CV 1, choroidal volume measurements obtained by Observer 1; Mean CV 2, choroidal volume measurements obtained by Observer 2.

^*95% limits of agreement = mean difference ±1.96 × SD.