Table 4.
Distribution of DR staging between Ground Truth grading and AI results for the external validation dataset
| AI Grade | Consensus grade (GT) for external validation set | Total | |||||
|---|---|---|---|---|---|---|---|
| No DR | Mild NPDR | Mod NPDR | Severe NPDR | PDR | |||
| No DR | 497 | 62 | 1 | 0 | 0 | 560 (46.7%) | |
| Mild NPDR | 48 | 141 | 22 | 0 | 0 | 211 (17.6%) | |
| Mod NPDR | 1 | 19 | 246 | 7 | 0 | 273 (22.8%) | |
| Severe NPDR | 0 | 0 | 78 | 52 | 8 | 138 (11.5%) | |
| PDR | 0 | 0 | 1 | 1 | 16 | 18 (1.5%) | |
| Total | 546 (45.5%) | 222 (18.5%) | 348 (29.0%) | 60 (5.0%) | 24 (2.0%) | 1200 | |
| Weighted Kappaa | 0.82173 | ||||||
| Standard error | 0.01013 | ||||||
| 95% CI | 0.80187-0.84159 | ||||||
aLinear weights. The percentage values in brackets indicate the proportion of cases under each stage of DR