More participants in the citalopram group had an increase @ ms from baseline to week @ ( @ in citalopram versus @ in placebo ; Fisher 's exact p = @ ) , but only slightly more in the citalopram group met a gender-specific threshold for prolonged QTc ( @ ms for males ; @ ms for females ) at any point during follow-up ( @ in citalopram versus @ in placebo , Fisher 's exact p = @ ) .