Figure 2. Paired Differences Between Partial Pressure of Carbon Dioxide, Arterial (Paco₂) and End-Tidal Carbon Dioxide (EtCO₂) by Hours Since Pediatric Intensive Care Unit (PICU) Admission.

A, Circles represent 445 Paco₂-EtCO₂ pairs for all 137 patients. B, Circles represent 420 Paco₂-EtCO₂ pairs for the 127 patients who survived 24 hours since PICU admission. Solid line indicates mean difference between Paco₂ and EtCO₂ by hour since PICU admission. Sharded areas indicate 95% prediction interval of the mean difference between Paco₂ and EtCO₂.