Table 2.

Gastric pH

References	Gastric pH continuous	Gastric pH intermittent
Bonten et al. [22]	2.2 (IQR 1.3–3.9)	3.5 (IQR 1.8–5.2)
Gowardman et al. [26]	5	4
Spilker et al. [32]	4.7 (SD 0.5)	3.8 (SD 0.6)