{
 "project": "ER Waits, Ranked (Open Nshipyard P10)",
 "built": "2026-10-10",
 "source": "Ontario Health, Time Spent in Emergency Departments (drivepublic.hqontario.ca endpoints); data asset NACRS via CIHI",
 "source_url": "https://ontariohealth.ca/system/reporting/performance/time-spent-in-emergency-departments.html",
 "vintage": "2025-08 to 2026-08 (monthly)",
 "n_sites": 159,
 "n_months": 13,
 "indicators": {
  "PIA": "first_assessment",
  "L": "low_urgency_stay",
  "NAH": "high_urgency_stay",
  "A": "admitted_stay"
 },
 "caveats": [
  "As of the December 2025 data refresh, 43 additional sites were added to current and historical reporting; Ontario Health warns data exported after that should not be compared to earlier exports.",
  "Monthly averages only. No visit-level timestamps exist in any open source, so hour-of-day arrival analysis is honestly unanswerable.",
  "Averages, not medians. A few long stays pull the average up."
 ]
}