Maternal HEI was significantly improved at both 28 ( 73.356.62 versus 71.867.01 ; adjusted difference in means 1.58 ; 95 % CI 0.89 to 2.27 ; P < 0.0001 ) and 36 ( 72.956.82 versus 71.177.69 ; adjusted difference in means 1.77 ; 95 % CI 1.01 to 2.53 ; P < 0.0001 ) weeks .