Pediatric Chest X-Ray Encounters

From the PHIS+ dataset, we identified all encounters for children ages 3 months to 18 years with a CXR performed in the ED and for which corresponding clinical data were identifiable within PHIS+. We only included children whose ED visits resulted in discharge or admission, thus excluding ambulatory or surgical encounters. For encounters with multiple CXRs during the same encounter, we retained the first. All types of CXR series were included, including portable, single-view, two-view, multiple-view, and foreign body aspiration series, regardless of the imaging study indication. Records with incomplete or missing CXR reports were excluded.