The repeatability of superficial retinal vessel density measurements in eyes with long axial length using optical coherence tomography angiography

Table 2 Statistical analysis results: ICC of VLD, PD and FAZ

Scan patterns and metrics		22 mm ≤ AL < 26 mm		26 mm ≤ AL < 28 mm		Total
Scan patterns and metrics		ICC	ICC_adj	ICC	ICC_adj	ICC	ICC_adj
VLD	3 × 3 inner	0.90(0.81–0.95)	0.91	0.78(0.56–0.88)	0.75	0.83(0.74–0.90)	0.83
	6 × 6 inner	0.76(0.56–0.87)	0.76	0.41(0.05–0.67)	0.41	0.54(0.31–0.70)	0.54
	6 × 6 outer	0.61(0.34–0.79)	0.61	0.43(0.08–0.69)	0.43	0.50(0.28–0.66)	0.50
PD	3 × 3 inner	0.90(0.81–0.95)	0.90	0.80(0.63–0.90)	0.81	0.86(0.77–0.91)	0.85
	6 × 6 inner	0.71(0.49–0.85)	0.71	0.43(0.07–0.68)	0.43	0.52(0.31–0.68)	0.52
	6 × 6 outer	0.55(0.26–0.75)	0.54	0.40(0.04–0.67)	0.40	0.46(0.23–0.64)	0.46
FAZ	3 × 3	0.96(0.92–0.98)	0.96	0.86(0.73–0.94)	0.80	0.92(0.87–0.95)	0.92
FAZ	6 × 6	0.69(0.46–0.84)	0.69	0.62(0.34–0.80)	0.60	0.65(0.48–0.77)	0.67

ICCs of VLD, PD and FAZ in two groups measured by 3 × 3 mm and 6 × 6 mm scan patterns are presented in Table 2. The columns of ICC_adj showed the ICCs adjusted for inter-eye correlation using a mixed-design analysis of variance model
Abbreviations: VLD vessel length density, PD perfusion density, FAZ fovea avascular zone, AL axial length, ICC_adj adjusted ICC

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