Endogenous pain modulation by distraction reduced mean gastric pain by 11.9 on the 0-100 visual analog scale ( 95 % CI : 3.8-20 .1 ) in controls ( p = 0.006 ) and by 2.0 ( -6.18 to 10.44 ) in FD ( p = 0.6 ) , with greater EPM in controls than in FD ( difference -13.3 [ -26.1 to -0.5 ] ; p = 0.04 ) .