{
  "external_dataset": "ctmedtech/DDR-dataset (DR_grading/test)",
  "threshold": 0.36,
  "threshold_rule": "APTOS validation, 90% sensitivity floor",
  "aptos_test": {
    "kappa": 0.873,
    "accuracy": 0.8018,
    "auc": 0.9823,
    "sensitivity": 0.9148,
    "specificity": 0.9266
  },
  "ddr_external": {
    "kappa": 0.4,
    "accuracy": 0.5462,
    "auc": 0.7844,
    "sensitivity": 0.3172,
    "specificity": 0.9816
  },
  "ddr_counts": {
    "gradable": 3759,
    "ungradable": 346
  }
}