A significant inverse relation was observed between dietary folate equivalent ( R ( 2 ) = 0.201 , B = -0.002 , P = .045 , 95 % confidence interval [ CI ] [ -0.004 , -0.001 ] ) and FA ( R ( 2 ) = 0.255 , B = -0.005 , P = .036 , 95 % CI [ -0.009 , -0.002 ] ) consumption and migraine frequency .