Table 2 Comparisons of optical coherence tomography and angiography parameters between controls and eyes with hypertensive retinopathy (n = 274)

Variables	Controls (n = 112)	Case Group			Total case (n = 162)
Variables	Controls (n = 112)	Grade I HR (n = 30)	Grade IIHR (n = 72)	Grade III HR (n = 60)	Total case (n = 162)
Right eyes (%)	53 (47.3)	17 (56.7)	35 (48.6)	28 (46.7)	80 (49.4)
FAZA (mm²)	0.4 (0.3, 0.4)	0.4 (0.3, 0.5)	0.4 (0.3, 0.4)	0.3 (0.2, 0.4)^bc	0.3 (0.3, 0.4)
FAZP (mm)	3.0 (2.6, 3.2)	2.9 (2.5, 3.7)	2.9 (2.6, 3.3)	2.7 (2.4, 3.1)	2.9 (2.5, 3.3)
FAZC	0.5 ± 0.1	0.5 ± 0.1	0.5 ± 0.1	0.5 ± 0.1	0.5 ± 0.1
CMT (μm)	260.7 ± 16.2	250.7 ± 15.3^a	254.2 ± 19.2	256.5 ± 23.2	254.4 ± 20.1^a
SVD (mm⁻¹)	19.9 (19.2, 20.6)	19.7 (19.0, 20.1)	19.5 (18.8, 20.0)^a	19.3 (18.0, 19.8)^a	19.4 (18.7, 20.0)^a
DVD (mm⁻¹)	20.4 (19.5, 21.0)	19.7 (18.3, 20.7)	19.1 (17.0, 20.1)^a	18.2 (15.9, 19.8)^a	19.0 (16.8, 20.1)^a
SPD (%)	51.8 (51.2, 52.7)	52.0 (51.2, 52.8)	50.9 (49.8, 52.2)^a	51.0 (49.3, 51.9)^ab	51.1 (49.8, 52.2)^a
DPD (%)	47.9 (45.8, 49.2)	47.0 (42.9, 48.1)	44.5 (40.3, 47.2)^a	42.5 (36.5, 47.6)^a	44.3 (38.8, 47.8)^a

Continuous data meeting normal distribution were described as mean ± standard deviation and an analysis of variance (independent t test) was performed to compare the differences among the four groups (between the two groups). Otherwise median (Q1, Q3) and the Kruskal–Wallis H-test (Mann–Whitney U-test) was used. Categorical data were described as number of cases (%) and a χ² test was selected to compare the differences.
HR hypertensive retinopathy, FAZA foveal avascular zone area, FAZP foveal avascular zone perimeter, FAZC foveal avascular zone circularity, CMT central macular thickness, SVD superficial vessel density, DVD deep vessel density, SPD superficial perfusion density, DPD deep perfusion density
^aStatistically different compared with controls (P < 0.05)
^bStatistically different compared with grade I HR (P < 0.05)
^cStatistically different compared with grade II HR (P < 0.05)

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