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  "dataset_doi": "https://doi.org/10.13026/2hsy-t491",
  "paper_doi": "https://doi.org/10.1038/s41597-022-01202-y",
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          "primary_median_ms": 18.95,
          "sensitivity_median_ms": 18.333,
          "median_shift_ms": -0.618
        },
        {
          "age_band": "60–69",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 24,
          "n_sensitivity": 24,
          "primary_median_ms": 31.566,
          "sensitivity_median_ms": 31.566,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "60–69",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 24,
          "n_sensitivity": 24,
          "primary_median_ms": 21.228,
          "sensitivity_median_ms": 21.228,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "70–92",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 27,
          "n_sensitivity": 27,
          "primary_median_ms": 28.829,
          "sensitivity_median_ms": 28.829,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "70–92",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 27,
          "n_sensitivity": 27,
          "primary_median_ms": 23.924,
          "sensitivity_median_ms": 22.116,
          "median_shift_ms": -1.808
        }
      ]
    },
    "lead_i_sensitivity": {
      "selection_rule": "use ECG1/lead I for all device-0 records; device-1 records remain ECG/lead II because only one ECG signal is available",
      "alternate_channels_selected_among_multi": 621,
      "qc_pass_records": 1088,
      "primary_eligible_records": 1055,
      "sensitivity_eligible_records": 1064,
      "eligible_record_change": 9,
      "maximum_absolute_age_sex_median_shift_ms": 3.795,
      "maximum_shift_cell": {
        "age_band": "40–49",
        "sex": "female",
        "metric": "RMSSD",
        "median_shift_ms": -3.795
      },
      "published_cell_median_shifts": [
        {
          "age_band": "18–29",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 222,
          "n_sensitivity": 225,
          "primary_median_ms": 59.396,
          "sensitivity_median_ms": 59.45,
          "median_shift_ms": 0.054
        },
        {
          "age_band": "18–29",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 222,
          "n_sensitivity": 225,
          "primary_median_ms": 46.466,
          "sensitivity_median_ms": 45.075,
          "median_shift_ms": -1.392
        },
        {
          "age_band": "18–29",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 458,
          "n_sensitivity": 462,
          "primary_median_ms": 54.725,
          "sensitivity_median_ms": 54.441,
          "median_shift_ms": -0.284
        },
        {
          "age_band": "18–29",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 458,
          "n_sensitivity": 462,
          "primary_median_ms": 49.078,
          "sensitivity_median_ms": 48.162,
          "median_shift_ms": -0.917
        },
        {
          "age_band": "30–39",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 75,
          "n_sensitivity": 75,
          "primary_median_ms": 51.028,
          "sensitivity_median_ms": 51.124,
          "median_shift_ms": 0.096
        },
        {
          "age_band": "30–39",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 75,
          "n_sensitivity": 75,
          "primary_median_ms": 33.797,
          "sensitivity_median_ms": 33.797,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "30–39",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 65,
          "n_sensitivity": 67,
          "primary_median_ms": 51.769,
          "sensitivity_median_ms": 52.04,
          "median_shift_ms": 0.271
        },
        {
          "age_band": "30–39",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 65,
          "n_sensitivity": 67,
          "primary_median_ms": 42.419,
          "sensitivity_median_ms": 42.869,
          "median_shift_ms": 0.45
        },
        {
          "age_band": "40–49",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 49,
          "n_sensitivity": 50,
          "primary_median_ms": 35.146,
          "sensitivity_median_ms": 38.432,
          "median_shift_ms": 3.285
        },
        {
          "age_band": "40–49",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 49,
          "n_sensitivity": 50,
          "primary_median_ms": 24.529,
          "sensitivity_median_ms": 26.311,
          "median_shift_ms": 1.781
        },
        {
          "age_band": "40–49",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 45,
          "n_sensitivity": 44,
          "primary_median_ms": 39.991,
          "sensitivity_median_ms": 40.406,
          "median_shift_ms": 0.415
        },
        {
          "age_band": "40–49",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 45,
          "n_sensitivity": 44,
          "primary_median_ms": 34.832,
          "sensitivity_median_ms": 31.037,
          "median_shift_ms": -3.795
        },
        {
          "age_band": "50–59",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 36,
          "n_sensitivity": 36,
          "primary_median_ms": 34.453,
          "sensitivity_median_ms": 34.472,
          "median_shift_ms": 0.019
        },
        {
          "age_band": "50–59",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 36,
          "n_sensitivity": 36,
          "primary_median_ms": 21.237,
          "sensitivity_median_ms": 22.166,
          "median_shift_ms": 0.928
        },
        {
          "age_band": "50–59",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 30,
          "n_sensitivity": 30,
          "primary_median_ms": 37.056,
          "sensitivity_median_ms": 37.021,
          "median_shift_ms": -0.035
        },
        {
          "age_band": "50–59",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 30,
          "n_sensitivity": 30,
          "primary_median_ms": 21.725,
          "sensitivity_median_ms": 22.019,
          "median_shift_ms": 0.294
        },
        {
          "age_band": "60–69",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 17,
          "n_sensitivity": 17,
          "primary_median_ms": 29.636,
          "sensitivity_median_ms": 29.636,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "60–69",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 17,
          "n_sensitivity": 17,
          "primary_median_ms": 18.95,
          "sensitivity_median_ms": 18.333,
          "median_shift_ms": -0.618
        },
        {
          "age_band": "60–69",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 24,
          "n_sensitivity": 24,
          "primary_median_ms": 31.566,
          "sensitivity_median_ms": 31.566,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "60–69",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 24,
          "n_sensitivity": 24,
          "primary_median_ms": 21.228,
          "sensitivity_median_ms": 21.228,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "70–92",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 27,
          "n_sensitivity": 27,
          "primary_median_ms": 28.829,
          "sensitivity_median_ms": 28.978,
          "median_shift_ms": 0.149
        },
        {
          "age_band": "70–92",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 27,
          "n_sensitivity": 27,
          "primary_median_ms": 23.924,
          "sensitivity_median_ms": 22.693,
          "median_shift_ms": -1.231
        }
      ]
    },
    "interpretation": "Aggregate medians are robust to channel policy, but individual-channel differences can be large. Automated channel preference is a sensitivity analysis, not independently validated ground truth."
  },
  "detector_and_lead_audit": {
    "primary_channel": "lead II fixed before signal inspection: ECG2 for Task Force Monitor records and ECG for MP150/CNAP records",
    "primary_detector": "NeuroKit morphology-aware detector on NeuroKit-cleaned ECG",
    "count_disagreement_threshold": "exclude a primary-QC-pass record when beat counts differ by more than 10% of the larger count, or when a comparison count is unavailable",
    "secondary_detector_used_for_qc": {
      "method": "Elgendi 2010 via NeuroKit",
      "paired_records": 1121,
      "records_with_computable_counts": 1112,
      "relative_difference_quantiles": {
        "median": 0.0025,
        "p90": 0.0126,
        "p95": 0.0592,
        "p99": 0.4603,
        "maximum": 0.9268
      },
      "missing_or_over_10_percent": 59,
      "aggregate_metric_sensitivity": {
        "primary_eligible_records": 1055,
        "sensitivity_eligible_records": 1058,
        "eligible_record_change": 3,
        "maximum_absolute_age_sex_median_shift_ms": 10.652,
        "maximum_shift_cell": {
          "age_band": "60–69",
          "sex": "male",
          "metric": "SDNN",
          "median_shift_ms": 10.652
        },
        "published_cell_median_shifts": [
          {
            "age_band": "18–29",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 222,
            "n_sensitivity": 219,
            "primary_median_ms": 59.396,
            "sensitivity_median_ms": 61.766,
            "median_shift_ms": 2.37
          },
          {
            "age_band": "18–29",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 222,
            "n_sensitivity": 219,
            "primary_median_ms": 46.466,
            "sensitivity_median_ms": 49.897,
            "median_shift_ms": 3.431
          },
          {
            "age_band": "18–29",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 458,
            "n_sensitivity": 460,
            "primary_median_ms": 54.725,
            "sensitivity_median_ms": 58.054,
            "median_shift_ms": 3.329
          },
          {
            "age_band": "18–29",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 458,
            "n_sensitivity": 460,
            "primary_median_ms": 49.078,
            "sensitivity_median_ms": 53.938,
            "median_shift_ms": 4.859
          },
          {
            "age_band": "30–39",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 75,
            "n_sensitivity": 72,
            "primary_median_ms": 51.028,
            "sensitivity_median_ms": 53.896,
            "median_shift_ms": 2.868
          },
          {
            "age_band": "30–39",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 75,
            "n_sensitivity": 72,
            "primary_median_ms": 33.797,
            "sensitivity_median_ms": 39.422,
            "median_shift_ms": 5.625
          },
          {
            "age_band": "30–39",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 65,
            "n_sensitivity": 68,
            "primary_median_ms": 51.769,
            "sensitivity_median_ms": 58.126,
            "median_shift_ms": 6.357
          },
          {
            "age_band": "30–39",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 65,
            "n_sensitivity": 68,
            "primary_median_ms": 42.419,
            "sensitivity_median_ms": 52.8,
            "median_shift_ms": 10.381
          },
          {
            "age_band": "40–49",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 49,
            "n_sensitivity": 50,
            "primary_median_ms": 35.146,
            "sensitivity_median_ms": 43.987,
            "median_shift_ms": 8.841
          },
          {
            "age_band": "40–49",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 49,
            "n_sensitivity": 50,
            "primary_median_ms": 24.529,
            "sensitivity_median_ms": 30.197,
            "median_shift_ms": 5.667
          },
          {
            "age_band": "40–49",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 45,
            "n_sensitivity": 47,
            "primary_median_ms": 39.991,
            "sensitivity_median_ms": 42.224,
            "median_shift_ms": 2.234
          },
          {
            "age_band": "40–49",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 45,
            "n_sensitivity": 47,
            "primary_median_ms": 34.832,
            "sensitivity_median_ms": 37.645,
            "median_shift_ms": 2.813
          },
          {
            "age_band": "50–59",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 36,
            "n_sensitivity": 37,
            "primary_median_ms": 34.453,
            "sensitivity_median_ms": 38.361,
            "median_shift_ms": 3.908
          },
          {
            "age_band": "50–59",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 36,
            "n_sensitivity": 37,
            "primary_median_ms": 21.237,
            "sensitivity_median_ms": 27.46,
            "median_shift_ms": 6.223
          },
          {
            "age_band": "50–59",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 30,
            "n_sensitivity": 29,
            "primary_median_ms": 37.056,
            "sensitivity_median_ms": 38.656,
            "median_shift_ms": 1.599
          },
          {
            "age_band": "50–59",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 30,
            "n_sensitivity": 29,
            "primary_median_ms": 21.725,
            "sensitivity_median_ms": 29.199,
            "median_shift_ms": 7.475
          },
          {
            "age_band": "60–69",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 17,
            "n_sensitivity": 17,
            "primary_median_ms": 29.636,
            "sensitivity_median_ms": 40.289,
            "median_shift_ms": 10.652
          },
          {
            "age_band": "60–69",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 17,
            "n_sensitivity": 17,
            "primary_median_ms": 18.95,
            "sensitivity_median_ms": 27.056,
            "median_shift_ms": 8.105
          },
          {
            "age_band": "60–69",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 24,
            "n_sensitivity": 25,
            "primary_median_ms": 31.566,
            "sensitivity_median_ms": 40.968,
            "median_shift_ms": 9.401
          },
          {
            "age_band": "60–69",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 24,
            "n_sensitivity": 25,
            "primary_median_ms": 21.228,
            "sensitivity_median_ms": 31.433,
            "median_shift_ms": 10.205
          },
          {
            "age_band": "70–92",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 27,
            "n_sensitivity": 27,
            "primary_median_ms": 28.829,
            "sensitivity_median_ms": 34.814,
            "median_shift_ms": 5.985
          },
          {
            "age_band": "70–92",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 27,
            "n_sensitivity": 27,
            "primary_median_ms": 23.924,
            "sensitivity_median_ms": 33.975,
            "median_shift_ms": 10.051
          }
        ]
      }
    },
    "two_lead_count_audit": {
      "method": "same NeuroKit detector on ECG2/lead II versus ECG1/lead I for the Task Force Monitor subset",
      "paired_records": 621,
      "records_with_computable_counts": 610,
      "relative_difference_quantiles": {
        "median": 0.0,
        "p90": 0.0072,
        "p95": 0.05,
        "p99": 0.4714,
        "maximum": 0.5
      },
      "missing_or_over_10_percent": 38
    },
    "pantompkins_sensitivity_not_used_for_qc": {
      "method": "Pan-Tompkins 1985 via NeuroKit on fixed lead II",
      "paired_records": 1121,
      "records_with_computable_counts": 1112,
      "relative_difference_quantiles": {
        "median": 0.003,
        "p90": 0.3788,
        "p95": 0.4993,
        "p99": 0.5298,
        "maximum": 0.9407
      },
      "missing_or_over_10_percent": 178,
      "aggregate_metric_sensitivity": {
        "primary_eligible_records": 1055,
        "sensitivity_eligible_records": 1035,
        "eligible_record_change": -20,
        "maximum_absolute_age_sex_median_shift_ms": 47.468,
        "maximum_shift_cell": {
          "age_band": "60–69",
          "sex": "male",
          "metric": "RMSSD",
          "median_shift_ms": 47.468
        },
        "published_cell_median_shifts": [
          {
            "age_band": "18–29",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 222,
            "n_sensitivity": 220,
            "primary_median_ms": 59.396,
            "sensitivity_median_ms": 76.382,
            "median_shift_ms": 16.986
          },
          {
            "age_band": "18–29",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 222,
            "n_sensitivity": 220,
            "primary_median_ms": 46.466,
            "sensitivity_median_ms": 82.161,
            "median_shift_ms": 35.694
          },
          {
            "age_band": "18–29",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 458,
            "n_sensitivity": 447,
            "primary_median_ms": 54.725,
            "sensitivity_median_ms": 68.9,
            "median_shift_ms": 14.175
          },
          {
            "age_band": "18–29",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 458,
            "n_sensitivity": 447,
            "primary_median_ms": 49.078,
            "sensitivity_median_ms": 74.728,
            "median_shift_ms": 25.65
          },
          {
            "age_band": "30–39",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 75,
            "n_sensitivity": 71,
            "primary_median_ms": 51.028,
            "sensitivity_median_ms": 66.079,
            "median_shift_ms": 15.051
          },
          {
            "age_band": "30–39",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 75,
            "n_sensitivity": 71,
            "primary_median_ms": 33.797,
            "sensitivity_median_ms": 68.154,
            "median_shift_ms": 34.357
          },
          {
            "age_band": "30–39",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 65,
            "n_sensitivity": 65,
            "primary_median_ms": 51.769,
            "sensitivity_median_ms": 69.328,
            "median_shift_ms": 17.559
          },
          {
            "age_band": "30–39",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 65,
            "n_sensitivity": 65,
            "primary_median_ms": 42.419,
            "sensitivity_median_ms": 73.202,
            "median_shift_ms": 30.783
          },
          {
            "age_band": "40–49",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 49,
            "n_sensitivity": 49,
            "primary_median_ms": 35.146,
            "sensitivity_median_ms": 57.683,
            "median_shift_ms": 22.537
          },
          {
            "age_band": "40–49",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 49,
            "n_sensitivity": 49,
            "primary_median_ms": 24.529,
            "sensitivity_median_ms": 57.69,
            "median_shift_ms": 33.16
          },
          {
            "age_band": "40–49",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 45,
            "n_sensitivity": 43,
            "primary_median_ms": 39.991,
            "sensitivity_median_ms": 58.662,
            "median_shift_ms": 18.672
          },
          {
            "age_band": "40–49",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 45,
            "n_sensitivity": 43,
            "primary_median_ms": 34.832,
            "sensitivity_median_ms": 60.019,
            "median_shift_ms": 25.187
          },
          {
            "age_band": "50–59",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 36,
            "n_sensitivity": 37,
            "primary_median_ms": 34.453,
            "sensitivity_median_ms": 51.729,
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          },
          {
            "age_band": "50–59",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 36,
            "n_sensitivity": 37,
            "primary_median_ms": 21.237,
            "sensitivity_median_ms": 49.603,
            "median_shift_ms": 28.366
          },
          {
            "age_band": "50–59",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 30,
            "n_sensitivity": 28,
            "primary_median_ms": 37.056,
            "sensitivity_median_ms": 49.685,
            "median_shift_ms": 12.629
          },
          {
            "age_band": "50–59",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 30,
            "n_sensitivity": 28,
            "primary_median_ms": 21.725,
            "sensitivity_median_ms": 56.474,
            "median_shift_ms": 34.749
          },
          {
            "age_band": "60–69",
            "sex": "male",
            "metric": "SDNN",
            "n_primary": 17,
            "n_sensitivity": 17,
            "primary_median_ms": 29.636,
            "sensitivity_median_ms": 58.743,
            "median_shift_ms": 29.106
          },
          {
            "age_band": "60–69",
            "sex": "male",
            "metric": "RMSSD",
            "n_primary": 17,
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            "primary_median_ms": 18.95,
            "sensitivity_median_ms": 66.418,
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          },
          {
            "age_band": "60–69",
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            "metric": "SDNN",
            "n_primary": 24,
            "n_sensitivity": 25,
            "primary_median_ms": 31.566,
            "sensitivity_median_ms": 55.161,
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          },
          {
            "age_band": "60–69",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 24,
            "n_sensitivity": 25,
            "primary_median_ms": 21.228,
            "sensitivity_median_ms": 63.511,
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          },
          {
            "age_band": "70–92",
            "sex": "female",
            "metric": "SDNN",
            "n_primary": 27,
            "n_sensitivity": 27,
            "primary_median_ms": 28.829,
            "sensitivity_median_ms": 58.038,
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          },
          {
            "age_band": "70–92",
            "sex": "female",
            "metric": "RMSSD",
            "n_primary": 27,
            "n_sensitivity": 27,
            "primary_median_ms": 23.924,
            "sensitivity_median_ms": 67.264,
            "median_shift_ms": 43.34
          }
        ]
      },
      "reason_not_adopted": "This implementation frequently double-detected T waves and its non-apex timestamps inflated short-term HRV. It is reported as a sensitivity comparator rather than selected after seeing HRV values."
    },
    "concordance_qc_effect": {
      "new_exclusions_among_primary_qc_pass": 35,
      "primary_eligible_records": 1055,
      "sensitivity_eligible_records": 1021,
      "eligible_record_change": -34,
      "maximum_absolute_age_sex_median_shift_ms": 3.857,
      "maximum_shift_cell": {
        "age_band": "40–49",
        "sex": "female",
        "metric": "RMSSD",
        "median_shift_ms": -3.857
      },
      "published_cell_median_shifts": [
        {
          "age_band": "18–29",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 222,
          "n_sensitivity": 215,
          "primary_median_ms": 59.396,
          "sensitivity_median_ms": 59.285,
          "median_shift_ms": -0.111
        },
        {
          "age_band": "18–29",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 222,
          "n_sensitivity": 215,
          "primary_median_ms": 46.466,
          "sensitivity_median_ms": 45.56,
          "median_shift_ms": -0.906
        },
        {
          "age_band": "18–29",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 458,
          "n_sensitivity": 442,
          "primary_median_ms": 54.725,
          "sensitivity_median_ms": 54.307,
          "median_shift_ms": -0.418
        },
        {
          "age_band": "18–29",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 458,
          "n_sensitivity": 442,
          "primary_median_ms": 49.078,
          "sensitivity_median_ms": 47.875,
          "median_shift_ms": -1.203
        },
        {
          "age_band": "30–39",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 75,
          "n_sensitivity": 71,
          "primary_median_ms": 51.028,
          "sensitivity_median_ms": 50.765,
          "median_shift_ms": -0.263
        },
        {
          "age_band": "30–39",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 75,
          "n_sensitivity": 71,
          "primary_median_ms": 33.797,
          "sensitivity_median_ms": 33.726,
          "median_shift_ms": -0.071
        },
        {
          "age_band": "30–39",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 65,
          "n_sensitivity": 64,
          "primary_median_ms": 51.769,
          "sensitivity_median_ms": 51.62,
          "median_shift_ms": -0.149
        },
        {
          "age_band": "30–39",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 65,
          "n_sensitivity": 64,
          "primary_median_ms": 42.419,
          "sensitivity_median_ms": 41.894,
          "median_shift_ms": -0.525
        },
        {
          "age_band": "40–49",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 49,
          "n_sensitivity": 48,
          "primary_median_ms": 35.146,
          "sensitivity_median_ms": 35.721,
          "median_shift_ms": 0.575
        },
        {
          "age_band": "40–49",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 49,
          "n_sensitivity": 48,
          "primary_median_ms": 24.529,
          "sensitivity_median_ms": 25.322,
          "median_shift_ms": 0.793
        },
        {
          "age_band": "40–49",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 45,
          "n_sensitivity": 41,
          "primary_median_ms": 39.991,
          "sensitivity_median_ms": 39.648,
          "median_shift_ms": -0.342
        },
        {
          "age_band": "40–49",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 45,
          "n_sensitivity": 41,
          "primary_median_ms": 34.832,
          "sensitivity_median_ms": 30.975,
          "median_shift_ms": -3.857
        },
        {
          "age_band": "50–59",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 36,
          "n_sensitivity": 36,
          "primary_median_ms": 34.453,
          "sensitivity_median_ms": 34.453,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "50–59",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 36,
          "n_sensitivity": 36,
          "primary_median_ms": 21.237,
          "sensitivity_median_ms": 21.237,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "50–59",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 30,
          "n_sensitivity": 29,
          "primary_median_ms": 37.056,
          "sensitivity_median_ms": 35.954,
          "median_shift_ms": -1.103
        },
        {
          "age_band": "50–59",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 30,
          "n_sensitivity": 29,
          "primary_median_ms": 21.725,
          "sensitivity_median_ms": 20.652,
          "median_shift_ms": -1.073
        },
        {
          "age_band": "60–69",
          "sex": "male",
          "metric": "SDNN",
          "n_primary": 17,
          "n_sensitivity": 17,
          "primary_median_ms": 29.636,
          "sensitivity_median_ms": 29.636,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "60–69",
          "sex": "male",
          "metric": "RMSSD",
          "n_primary": 17,
          "n_sensitivity": 17,
          "primary_median_ms": 18.95,
          "sensitivity_median_ms": 18.95,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "60–69",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 24,
          "n_sensitivity": 24,
          "primary_median_ms": 31.566,
          "sensitivity_median_ms": 31.566,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "60–69",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 24,
          "n_sensitivity": 24,
          "primary_median_ms": 21.228,
          "sensitivity_median_ms": 21.228,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "70–92",
          "sex": "female",
          "metric": "SDNN",
          "n_primary": 27,
          "n_sensitivity": 27,
          "primary_median_ms": 28.829,
          "sensitivity_median_ms": 28.829,
          "median_shift_ms": 0.0
        },
        {
          "age_band": "70–92",
          "sex": "female",
          "metric": "RMSSD",
          "n_primary": 27,
          "n_sensitivity": 27,
          "primary_median_ms": 23.924,
          "sensitivity_median_ms": 23.924,
          "median_shift_ms": 0.0
        }
      ]
    }
  },
  "sex_metadata": {
    "source_field": "Sex",
    "encoding": {
      "0": "male",
      "1": "female"
    },
    "semantics": "Binary male/female sex metadata supplied by the source dataset; it is not a measure of gender identity."
  },
  "analysis_window": "first 300 seconds of resting ECG",
  "r_peak_pipeline": "Fixed lead II + NeuroKit ECG cleaning and morphology-aware peak detection + Lipponen-Tarvainen/Kubios correction at native sampling rate; exclude >10% beat-count disagreement with Elgendi2010 and, where available, the simultaneously recorded lead I",
  "methodological_distinction": "This is an independent automated reanalysis of the first five minutes, not a reproduction of the source paper or Calderon-Juarez et al. 2023, which used a visually supervised final five-minute segment.",
  "published_outputs": [
    "autonomic-aging-age-sex-hrv.csv",
    "autonomic-aging-hrv-by-age-sex.svg",
    "autonomic-aging-hrv-by-age-sex.png",
    "build_autonomic_aging_reference.py"
  ],
  "privacy": "Only aggregate statistics are public; subject-level features are not published.",
  "measurement_warning": "These five-minute clinical ECG distributions are not interchangeable with intermittent Apple Watch HealthKit SDNN samples.",
  "published_output_sha256": {
    "autonomic-aging-age-sex-hrv.csv": "d89632ae28f52ac1e797ad72428211a60b9294074b8c298510a4e68e419ec607",
    "autonomic-aging-hrv-by-age-sex.svg": "56327958b721c6f9df0a81896ab6d8364f8c02220027e5031db187ab68d82ada",
    "autonomic-aging-hrv-by-age-sex.png": "38209ea6f31d540e22c5af573f8f1740c075f0faeb6d2e640e25e82d6e4b3466",
    "build_autonomic_aging_reference.py": "23e890654bc4131467c508e63e1a462fe000345f082389598401292b13c9b6d2"
  }
}
