Table 1.

Basic acid output before and after operation (^-x ± s, mmol/L)

Operation mode	n	Preoperation	Postoperation
PPVPG	64	7.75 ± 2.43	2.29 ± 1.25b
B I	24	7.51 ± 2.76	2.16 ± 1.28b
B II	20	7.21 ± 2.58	2.06 ± 1.23b

^bP < 0.01, vs preoperation.