On the first day of the study , the mean ( + / - s.d. ) percent of total time pH < 4 and the De Meester score were group A : 0.9 ( 1.2 ) and 4.1 ( 4.0 ) ; group B : 1.5 ( 1.6 ) and 7.0 ( 6.9 ) ; group C : 1.3 ( 1.0 ) and 6.0 ( 3.3 ) , respectively ( P = 0.262 and 0.134 , respectively ) .
