331 intubations), 77% (n = 208) of all pH results were 5.5.
In pH measurements without antacids 85.4% (n = 76)
was 5.5 as opposed to 72.9% (n = 132) with antacids
(P = 0.062). When pH was 6 there were 22% more false
negative results (tube located in the stomach) in the group
on antacids. The pH results with or without antacids are
illustrated in Fig. 3.
3