Table 2. Performance of the four automated strategies for detecting different grades of disease, together with the associated workload reduction.

DRSS category	Number identified by the automated system	Proportion identified (%) [95% confidence interval]
MA/BH/EX (both fields)
Unassessable	343/346	99.1 [97.5 to 99.7]
R0	3094/5141	60.2 [58.8 to 61.5]
R1	2065/2193	94.2 [93.1 to 95.1]
M1	390/395	98.7 [97.1 to 99.5]
R2	131/131	100 [97.2 to 100]
R3	61/61	100 [94.1 to 100]
Any retinopathy	2647/2780	95.2 [94.4 to 95.9]
Referable	582/587	99.1 [98.0 to 99.6]
(Workload reduction	2183/8267	26.4 [25.5 to 27.4])
MA(both fields)
Unassessable	339/346	98.0 [95.9 to 99.0]
R0	2806/5141	54.6 [53.2 to 55.9]
R1	2080/2193	94.8 [93.8 to 95.7]
M1	391/395	99.0 [97.4 to 99.6]
R2	131/131	100.0 [97.2 to 100.0]
R3	61/61	100 [94.1 to 100]
Any retinopathy	2663/2780	95.8 [95.0 to 96.5]
Referable	583/587	99.3 [98.3 to 99.7]
(Workload reduction	2459/8267	29.7 [28.8 to 30.7])
MA/BH/EX (macular field only)
Unassessable	342/346	98.8 [97.1 to 99.5]
R0	2607/5141	50.7 [49.3 to 52.1]
R1	1921/2193	87.6 [86.2 to 88.9]
M1	385/395	97.5 [95.4 to 98.6]
R2	131/131	100.0 [97.2 to 100.0]
R3	61/61	100 [94.1 to 100]
Any retinopathy	2498/2780	89.9 [88.7 to 90.9]
Referable	577/587	98.3 [96.9 to 99.1]
(Workload reduction	2820/8267	34.1 [33.1 to 35.1])
MA(macular field only)
Unassessable	337/346	97.4 [95.1 to 98.6]
R0	2229/5141	43.4 [42.0 to 44.7]
R1	1976/2193	90.1 [88.8 to 91.3]
M1	386/395	97.7 [95.7 to 98.8]
R2	131/131	100 [97.2 to 100]
R3	61/61	100 [94.1 to 100]
Any retinopathy	2554/2780	91.9 [90.8 to 92.8]
Referable	578/5877	98.5 [97.1 to 99.2]
(Workload reduction	3147/8267	38.1 [37.0 to 39.1])