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    "note": "Right-leg electrode is not an additional independent displayed lead. Common-potential invariance is a gauge property, not proof of different biological sources. Real time alignment, reference and filters matter."
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    "record": "BIDMC 01",
    "selection": "First catalog record, fixed 30–38 s window; not selected for commercial-device performance.",
    "waveform_samples_full": 60001,
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    "window_samples": 1001,
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    "limits": "Exported monitor waveforms, not raw photodiode intensity. PPG NU units; ECG calibrated mV as header. Shared file time does not provide calibration of hardware delay or a validated pulse transit time; no beat annotations or diagnostic ground truth are provided here."
  },
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        "case": 16,
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      {
        "case": 17,
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      {
        "case": 18,
        "beats": 12,
        "reported_mean_pulse_pressure_mmHg": 34.0,
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      {
        "case": 19,
        "beats": 9,
        "reported_mean_pulse_pressure_mmHg": 30.0,
        "green_acdc_mean": 0.02768118744444444,
        "green_acdc_sd": 0.002201807855949635,
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        "infrared_acdc_sd": 0.0008118387190675559
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    ],
    "equal_pressure_example": {
      "case_ids": [
        7,
        8
      ],
      "reported_pressure_mmHg": 44.0,
      "red_mean_ratio_case07_over08": 8.82043281588619,
      "note": "Matching reported pressure values are not equality of every instantaneous finger pressure. The README describes an arm-cuff measurement; any additional mapping to finger pressure in the full paper has not been verified. Optical/tissue/physiological contributions not causally isolated; no statement about validity of all PPG pressure estimation methods."
    },
    "limits": "Published anonymized finger PPG measurements and per-case pulse-pressure values; README describes arm-cuff pressure acquisition. No causal isolation of optical/vascular parameters; no original finite-element forward model or inverse accuracy reproduced."
  },
  "daily2022_quality": {
    "subjects": 31,
    "selected_pulses": 12400,
    "B": 5962,
    "F": 4612,
    "E": 1826,
    "basic": 6438,
    "basic_percent": 51.91935483870967,
    "detail_percent": 14.725806451612902,
    "note": "Each participant contributes 100 pulses from each of four activity strata. Not time-weighted all-day device availability. Quality labels are morphological categories, not proof of diagnostic validity. Groups differ in age/sex and source studies; no causal cancer effect estimated."
  },
  "FDA2018": {
    "enrolled": 602,
    "result_available": 556,
    "app_binary_output": 488,
    "reference_binary_and_app_binary": 479,
    "classifiable_AF_sensitivity": 0.9833333333333333,
    "classifiable_SR_specificity": 0.99581589958159,
    "AF_output_probability_including_unclassified_unreadable": 0.851985559566787,
    "SR_output_probability_including_unclassified_unreadable": 0.9049429657794676,
    "app_binary_output_fraction_among_results": 0.8776978417266187,
    "unclassified_or_unreadable_fraction_among_results": 0.1223021582733813,
    "note": "Conditional on the specified 2018 validation sets. Not population sensitivity or an evaluation of subsequent versions. Reference other/unreadable categories are excluded from the binary accuracy numerator/denominator."
  },
  "Apple2019": {
    "notification_fraction": 0.005153864683028975,
    "patch_return_fraction_among_notified": 0.20823692734844979,
    "AF_yield_later_patch": 0.34,
    "concurrent_subsequent_notification_PPV": 0.8372093023255814,
    "concurrent_irregular_tachogram_PPV": 0.7127812350406894,
    "note": "2017–2018 optical algorithm cohort, published 2019. AF includes flutter in the paper. Later patch vs simultaneous follow-up notification have different selection and timing; no overall sensitivity calculation."
  },
  "not_run": [
    "2018 or current commercial firmware/classifiers",
    "Original PPG pixel imaging or daily-life classifiers",
    "2026 finite-element model/216000 simulations or inverse-pressure validation",
    "Validated R-peak labels or transit timing for BIDMC",
    "Clinical diagnosis, individual recommendations or regulatory review of current devices"
  ]
}