. Author manuscript; available in PMC: 2015 Oct 1.

Published in final edited form as: Gastrointest Endosc Clin N Am. 2014 Aug 1;24(4):545–561. doi: 10.1016/j.giec.2014.07.001

Table 2.

Reported normal ranges of integrated relaxation pressure (IRP) for control subjects in a supine position among studies and among manometric devices. Upper limit of normal (UNL).

Author	Equipment	Number of controls	IRP (mmHg) 95^th percentile = ULN
			Mean	Median (ULN)
Ghosh⁵	Given	75	9	8 (15)
Sweis⁹	Given	23	4	3 (9)
Niebisch⁸	Given	68	9	9 (17)
Weijenborg¹⁰	Given	50	8	7 (16)
Bogte⁴	MMS -Solid state (Unisensor AG)	52	13	12 (28)
Kessing⁷	MMS – Water perfused system	50	8	7 (19)