Table 4 Recommended parameters to be considered/reported in prone ventilation outcome studies

Intra-abdominal pressure (IAP) (including measurement technique description, zero reference point, priming volume, IAP minimum, and IAP maximum)

Body mass index

Extravascular lung water index

Fluid balance

Body anthropomorphic data

Presence or absence of ascites

Intrathoracic pressure (ideally esophageal pressure and transdiaphragmatic pressure gradient)

Chest wall compliance (as a benefit of measuring intrathoracic pressure)

Etiology of acute lung injury/acute respiratory distress syndrome

Duration of prone ventilation

Technique of prone ventilation

Use or nonuse of thoracopelvic supports and exact position of supports

Total respiratory compliance

Lung compliance

Lower inflection point

Upper inflection point