Table 4 Classification systems for hypertensive retinopathy and interobserver agreement [kappa (standard error)] for KWB and OCTA classification systems (n = 90 eyes)

I (n = 30)

Arterial narrowing

1 (n = 25)

No detectable signs or only focal capillary sparsity

II (n = 30)

Definite focal narrowing and arteriovenous crossings

2 (n = 39)

Focal capillary sparsity, scattered microangioma and focal macular arch ring defect or a combination of these signs

III (n = 30)

Signs of grade 2 retinopathy plus hemorrhages, exudates and cotton wool spots

3 (n = 26)

Signs of stage 2 retinopathy plus focal capillary disorder and nonperfusion or a combination of these signs

Vs. gold standard

Z^a

Resident 1

0.865 (0.039)

0.959 (0.024)

−2.05

Resident 2

0.843 (0.041)

0.932 (0.030)

−1.75

Resident 1 vs. resident 2

0.784 (0.048)

0.891 (0.037)

−1.77