Table 2 Comparisons of the vessel density among groups with a signal strength (SS) from 7 to 10 (mm⁻¹).

	SS 7 (n = 94)	SS 8 (n = 162)	SS 9 (n = 125)	SS 10 (n = 65)	p-value^*	p-value^†	p-value^‡	p-value^§
Total area	12.71 ± 2.53	14.56 ± 1.91	16.18 ± 1.53	17.17 ± 1.12	<0.001	<0.001	<0.001	0.067
Center	3.98 ± 2.62	5.45 ± 2.84	6.85 ± 2.61	7.66 ± 2.42	<0.001	<0.001	<0.001	0.289
InnerAverage	11.66 ± 3.41	13.51 ± 2.94	15.66 ± 2.16	16.64 ± 1.60	<0.001	<0.001	<0.001	0.172
InnerSuperior	12.69 ± 3.47	14.73 ± 2.92	16.50 ± 2.22	17.37 ± 1.46	<0.001	<0.001	<0.001	0.214
InnerNasal	11.60 ± 3.96	13.75 ± 3.25	15.74 ± 2.44	16.67 ± 1.72	<0.001	<0.001	<0.001	0.285
InnerInferior	12.29 ± 3.61	13.92 ± 3.13	16.06 ± 2.35	16.89 ± 1.84	<0.001	<0.001	<0.001	0.379
InnerTemporal	9.62 ± 3.86	11.81 ± 3.82	14.30 ± 2.97	15.63 ± 2.29	<0.001	<0.001	<0.001	0.069
OuterAverage	14.65 ± 2.38	15.18 ± 1.74	16.68 ± 1.44	17.68 ± 1.05	<0.001	<0.001	<0.001	0.084
OuterSuperior	14.54 ± 2.63	16.13 ± 1.86	17.41 ± 1.52	18.25 ± 1.00	<0.001	<0.001	<0.001	0.022
OuterNasal	16.67 ± 3.04	18.21 ± 2.05	19.20 ± 1.43	19.63 ± 1.00	<0.001	<0.001	<0.001	0.999
OuterInferior	14.06 ± 2.64	15.76 ± 2.08	17.21 ± 1.81	18.07 ± 1.47	<0.001	<0.001	<0.001	0.044
OuterTemporal	8.27 ± 3.67	10.55 ± 3.24	12.86 ± 2.68	14.78 ± 2.19	<0.001	<0.001	<0.001	<0.001

Mean ± standard deviation.
^*The p-value was obtained from one-way analysis of variance.
^†The p-value was obtained from the post-hoc test (Bonferroni) between the SS 7 and SS 8 groups.
^‡The p-value was obtained from the post-hoc test (Bonferroni) between the SS 8 and SS 9 groups.
^§The p-value was obtained from the post-hoc test (Bonferroni) between the SS 9 and SS 10 groups.
Boldface numbers indicate statistically significant differences at p < 0.05.

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