Table 2.

Pressure topography baseline EGJ morphology and tone derived from an overview of the study.

EGJ
EGJ morphology	Type I:	Complete overlap of CD and LES components with single peak on the spatial pressure variation plot
	Type II:	Double-peaked pressure zone with the inter-peak nadir pressure greater than gastric pressure and a separation of 1–2 cm between peaks. This can vary or be present intermittently in which case the report should mention the range of observed LES-CD separation
	Type IIIa:	Double-peaked pressure zone with the inter-peak nadir pressure less than or equal to gastric pressure, but the pressure inversion point remains at the CD level. The range of observed LES-CD separation is reported
	Type IIIb:	Double-peaked pressure zone with the inter-peak nadir pressure equal to gastric pressure and the pressure inversion point at the LES level. The range of observed LES-CD separation is reported
LES-CD separation	The EGJ pressure profile on a spatial pressure variation plot at peak inspiration can be a single or double peak. If a single peak, the LES-CD separation is 0; if a double peak, LES-CD separation is the axial distance between peaks
Inspiratory EGJ pressure	Average of maximal inspiratory EGJ pressure reached during 3 respiratory cycles, ideally in a quiescent portion of recording, free of swallows
Expiratory EGJ pressure	Average EGJ pressure midway between adjacent inspirations for 3 respiratory cycles, ideally in a quiescent portion of recording, free of swallows