Repeatability and Reproducibility of Retinal Nerve Fiber Layer Parameters Measured by Scanning Laser Polarimetry with Enhanced Corneal Compensation in Normal and Glaucomatous Eyes

Table 4

Intravisit repeatability and intervisit reproducibility of SLP-ECC parameters in the glaucoma group ().

GDx parameters	Intravisit						Intervisit
	ICC	ICC 95% CI			COV; (%)	TRT; SD	ICC	ICC 95% CI			COV; (%)	TRT; SD
		Upper limit	Lower limit					Upper limit	Lower limit
NFI	0.982	0.972	0.989	<0.001	19.38	10.61	0.975	0.958	0.985	<0.001	15.82	12.84
TSNIT average	0.977	0.961	0.986	<0.001	4.40	3.53	0.977	0.961	0.986	<0.001	4.71	3.93
Superior average	0.920	0.878	0.950	<0.001	7.42	6.65	0.917	0.863	0.952	<0.001	7.88	6.86
Inferior average	0.960	0.939	0.975	<0.001	5.68	5.48	0.978	0.964	0.987	<0.001	5.36	5.13
TSNIT SD	0.951	0.924	0.969	<0.001	9.11	3.23	0.970	0.951	0.983	<0.001	8.30	2.83

ICC: intraclass correlation coefficient; CI: confidence interval; COV: coefficient of variation; TRT SD: test-retest variability; NFI: nerve fiber indicator; TSNIT: temporal-superior-nasal-inferior-temporal; SD: standard deviation.