In intention-to-treat analysis , comparison of women who received iron vs placebo , respectively , yielded the following results at birth : Plasmodium infection risk : @ % vs @ % ( crude difference , -@ % , @ % CI , -@ % to @ % ; P = @ ) ; birth weight : @ g vs @ g ( crude difference , @ g , @ % CI , @ to @ ; P = @ ) ; birth-weight-for-gestational-age z score : @ vs @ ( crude difference , @ , @ % CI , -@ to @ ; P = @ ) ; and at @ month after birth : maternal hemoglobin concentration : @ g/dL vs @ g/dL ( crude difference , @ g/dL , @ % CI , @ to @ ; P < @ ) ; geometric mean maternal plasma ferritin concentration : @ g/L vs @ g/L ( crude difference , @ % , @ % CI , @ % to @ % ; P < @ ) ; geometric mean neonatal plasma ferritin concentration : @ g/L vs @ g/L ( crude difference , @ % , @ % CI , @ % to @ % ; P = @ ) .