{
  "schema_version": "2.0.0",
  "analysis_date": "2026-08-25",
  "status": "unreviewed internal secondary analysis",
  "source": {
    "cohort": "Autonomic Aging",
    "doi": "10.13026/2hsy-t491",
    "held_out_candidates": 211,
    "eligible_candidates": 202,
    "excluded_candidates": 9
  },
  "public_protocol": {
    "design": "same-session, closed-set linkage evaluation",
    "enrollment_and_query_overlap": false,
    "model_fit_on_held_out_candidates": false,
    "implementation_details": "withheld",
    "withheld_items": [
      "feature definitions",
      "window length and selection rules",
      "preprocessing and quality rules",
      "standardization procedure",
      "comparison function",
      "code and intermediate artifacts"
    ]
  },
  "aggregate_results": {
    "top_1": {
      "hits": 62,
      "queries": 202,
      "accuracy": 0.306931,
      "random_rank_chance": 0.00495,
      "wilson_95": [0.247424, 0.373644]
    },
    "top_5": {
      "hits": 112,
      "queries": 202,
      "accuracy": 0.554455,
      "random_rank_chance": 0.024752,
      "wilson_95": [0.485533, 0.621345]
    },
    "top_10": {
      "hits": 133,
      "queries": 202,
      "accuracy": 0.658416,
      "random_rank_chance": 0.049505,
      "wilson_95": [0.590606, 0.720313]
    },
    "permutation_test": {
      "replicates": 20000,
      "smallest_reportable_one_sided_p": 0.00005
    },
    "direction_sensitivity": {
      "top_1_accuracy": 0.341584,
      "top_5_accuracy": 0.559406,
      "top_10_accuracy": 0.643564
    }
  },
  "limits": [
    "Enrollment and query records came from the same recording session.",
    "This was closed-set linkage, not authentication or proof of identity.",
    "The analysis does not establish stability across days, devices, sleep and wake, or Apple Watch.",
    "Shared session, sensor, preprocessing, or signal artifacts may contribute to linkage.",
    "The proprietary implementation is not published, so the model cannot be independently reproduced from this artifact."
  ],
  "privacy": {
    "published_subject_identifiers": false,
    "published_subject_level_results": false,
    "published_features_or_embeddings": false
  }
}