Reference	Objective	Design	Evidence
Brown et al. [281]	Validation of the Infectious Disease Society of America/American Thoracic Society 2007 guidelines for severe community‐acquired pneumonia	PCS	3B+
Bruns et al. [285]	Usefulness of consecutive C‐reactive protein measurements in follow‐up of severe community‐acquired pneumonia	PCS	3B+
Charles et al. [279]	SMART‐COP: a tool for predicting the need for intensive respiratory or vasopressor support in community‐acquired pneumonia	PCS	3A+
Marrie and Shariatzadeh [282]	Community‐acquired pneumonia requiring admission to an intensive care unit: a descriptive study	RCS	4A+
Phua et al. [278]	Validation and clinical implications of the IDSA/ATS minor criteria for severe community‐acquired pneumonia	PCS	3A+
Renaud et al. [284]	Association between timing of intensive care unit admission and outcomes for emergency department patients with community‐acquired pneumonia	PCS	3A+
Wu et al. [286]	Early evolution of arterial oxygenation in severe community‐acquired pneumonia: a prospective observational study	PCS	3B−