Writing for Pediatric Critical Care Medicine:A Checklist When Using Administrative and Clinical Databases for Research P ediatric Critical Care Medicine (PCCM) contains a great deal of research that uses large, multicenter, curated datasets. Three resources stand out because they are frequently accessed by PCCM researchers. The Pediatric Health Information System (PHIS) dataset of a children's hospitals network in the United States, which contains administrative information about inpatient encounters, including the PICU (https://www.childrenshospitals.org/content/ analytics/product-program/pediatric-health-information-system). The Virtual Pediatric Systems, LLC (VPS) registry of collaborating U.S. PICUs, which has patient data about diagnosis, physiology, and outcome (https://myvps.org). The Extracorporeal Life Support Organization (ELSO) international dataset of patients of any age supported with extracorporeal membrane oxygenation (ECMO), with a focus on patient physiology, device type, and outcomes information (https://elso.org/aboutus.aspx).These, and other curated datasets, provide the epidemiology of our field and this research has potential for being informative, hypothesis-generating, and much valued-see the summary of PCCM's 25-year highlights (1). However, there are precautions to consider when carrying out such work, particularly if there will be multiple reports from the same dataset. So, this sixth article in the "Writing for PCCM" series (2-6