Significantly higher concentrations of pertussis antibodies were measured at delivery in women who received Tdap during pregnancy vs postpartum ( eg , pertussis toxin antibodies : @ EU/mL -LSB- @ % CI , @-@ @ -RSB- and @ EU/mL -LSB- @ % CI , @-@ @ -RSB- , respectively ; P < @ ) and in their infants at birth ( @ EU/mL -LSB- @ % CI , @-@ @ -RSB- and @ EU/mL -LSB- @ % CI , @-@ @ -RSB- , respectively ; P < @ ) and at age @ months ( @ EU/mL -LSB- @ % CI , @-@ @ -RSB- and @ EU/mL -LSB- @ % CI , @-@ @ -RSB- , respectively ; P < @ ) .