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  "method": "Read last_update_date from every retained organization CSV. Count a record in the older-date group when its date is nonempty and earlier than 2021-10-01. Divide by the total NPI rows in that legal-name file. Retain the original profile age anchor of 2026-10-01, rather than moving the cutoff to the date this report was generated. Missing update dates are counted separately; none occur in this cohort.",
  "limits": "The date reflects the NPPES record, not a separate verification date for each phone, address, specialty or ownership field. A recently changed record may still contain old fields, while an old record may remain accurate. The selected legal names are not representative of all organization NPIs. No causal explanation for the difference between organizations is measured here.",
  "writer": "AI-assisted Provyx research draft",
  "independent_review": "Pending; unpublished"
}