Pddq represents the quality of patient demographic data. The quality framework of patient demographic data was developed by ONC, the US Department of Health, in cooperation with the Institute of Capability Maturity Model Integration, to improve the quality of patient demographic data in the medical industry. The PDDQ framework focuses on ensuring the uniqueness and accuracy of patient records, avoiding creating duplicate patient records, and managing existing duplicate records. Medical institutions can collect, verify, maintain and update demographic data of patients more effectively, and improve the quality and efficiency of medical services. It is very important for medical institutions to ensure the accuracy and consistency of patient information and support better medical decision-making and patient care.