Maternal β-Hemolytic Streptococcal Pharyngeal Exposure and Colonization in Pregnancy

Table 2

Changes in ASO and anti-DNase B titers between pregnancy trimesters.

	Mean (SD)			Change T1 to T2; median (IQR)	Change T2 to T3; median (IQR)
	1st trimester	2nd trimester	3rd trimester
ASO	112.0 (121.8)	105.9 (102.2)	102.8 (100.0)	−8 (−13, −1)^a	−5 (−14, 0)^a
Anti-DNase B
Wampole kit	134.5 (133.8)	122.0 (117.5)	126.5 (125.4)	0 (0, 0)	0 (0, 0)
Nephelometer	132.0 (123.0)	114.6 (126.5)	117.9 (111.8)	0 (−45, 0)^b	0 (−2.5, 1)

(paired samples -test).
(paired samples -test).
SD: standard deviation; IQR: interquartile range; ASO: antistreptolysin O.