Table 1.
Reasons for diabetic retinopathy referral in level 2 and level 3 readers and the consensus gold standard (N=559).
| Diabetic retinopathy grading | Reader A, n (%) | Level 3 reader for reader A, n (%) | Consensus gold standard for reader A, n (%) | Reader B, n (%) | Level 3 reader for reader B, n (%) | Consensus gold standard for reader B, n (%) | Consensus gold standard for all readings, n (%) |
| M>1 only (including R6) | 70 (76) | 57 (72) | 60 (72) | 38 (57) | 36 (58) | 42 (62) | 102 (67.6) |
| R6 and M6 only | 16 (17) | 17 (22) | 17 (21) | 18 (27) | 19 (31) | 19 (28) | 36 (23.8) |
| R>2 and M>1 | 5 (5) | 4 (5) | 4 (5) | 8 (12) | 7 (11) | 7 (10) | 11 (7.3) |
| R>2 only (including M6) | 1 (1) | 1 (1) | 2 (2) | 4 (5) | 0 (0) | 0 (0) | 2 (1.3) |
| Total referrals | 92 | 79 | 83 | 67 | 62 | 68 | 151 |