The occurrence of headaches was similar in DASH versus control , at high ( OR ( 95 % CI ) = 0.65 ( 0.37 to 1.12 ) ; p = 0.12 ) , intermediate ( 0.57 ( 0.29 to 1.12 ) ; p = 0.10 ) and low ( 0.64 ( 0.36 to 1.13 ) ; p = 0.12 ) sodium levels .