24-h median [ IQ ] percentages of time with gastric pH above 3 and 4 were higher with rabeprazole than omeprazole ( 46 [ 37-55 ] vs. 30 [ 15-55 ] % , 9 [ 5-11 ] % for placebo ) but the differences did not reach statistical significance ( p = 0.11 and 0.24 , respectively ) .