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Actual number of misclassifications resulting from the Viterbi algorithm
| States | Observed grade | |||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| No detectable retinopathy | Background retinopathy in one eye | Background retinopathy in both eyes | Referable maculopathy | Referable retinopathy (pre‐proliferative or proliferative) | ||
| Estimated true grade | 1 | 33 668 | 5 098 | 1 113 | 187 | 24 |
| 2 | 1 997 | 7 082 | 2 781 | 238 | 26 | |
| 3 | 245 | 388 | 6 430 | 687 | 143 | |
| 4 | 36 | 48 | 315 | 3 195 | 295 | |
| 5 | 9 | 15 | 207 | 375 | 1 237 | |
