Temporal Trends in Nonattendence Rate for Scheduled Outpatient Appointments.

Inclusion Criteria: * Appointments scheduled for outpatient medical care across all settings and specialties from January 1, 2016, to December 31, 2023 Exclusion Criteria: * Cancelled appointments, including cancellations made by the patient, medical team, and the appointment management system. * Appointments that do not correspond to scheduled in-person care (Teleconsultations, * Appointments for walk-in demand). * Scheduled appointments that are not for medical care (Health coverage or specialties that do not correspond to scheduled medical care, Appointments for procedures, * Appointments for complementary exams, Appointments for treatments such as speech therapy, physiotherapy, or other therapies). * Spontaneous overflow appointments where the patient spontaneously presents for care at that moment. These appointments cannot be absent as the present and the appointment are assigned simultaneously. * System errors that do not correspond to actual patient medical care appointments (Duplicate cancellations, Appointments where patient and physician coincide).