TABLE 1.

GMCs of serotype-specific anti-pneumococcal polysaccharide (anti-PPS) IgG and IgM and GMOPTs of anti-PPS antibodies 1 month after PCV9 immunization in toddlers who carried pneumococci of the same serotype in their nasopharynx (carriers) and those who did not carry the serotype (noncarriers)

Variable and serotype	Carriers		Noncarriers		P valuea
	n	GMC or GMOPT (95% CI)	n	GMC or GMOPT (95% CI)
IgG
6A	33	0.34 (0.23–0.51)	38	0.40 (0.26–0.62)	0.61
9V	6	2.90 (1.25–6.72)	65	1.72 (1.35–2.20)	0.22
14	12	0.51 (0.28–0.93)	55	1.65 (1.20–2.26)	0.002
19F	31	1.10 (0.75–1.63)	40	1.91 (1.32–2.75)	0.043
23F	18	0.63 (0.28–1.41)	53	0.93 (0.60–1.45)	0.37
IgM
6A	33	6.26 (5.00–7.84	38	7.71 (6.01–9.88)	0.22
9V	6	1.54 (0.87–2.75)	66	1.54 (1.26–1.88)	1
14	12	2.62 (1.61–4.27)	60	4.47 (3.62–5.52)	0.041
19F	31	1.91 (1.38–2.66)	40	2.07 (1.70–2.53)	0.66
23F	18	0.85 (0.43–1.68)	53	0.93 (0.69–1.26)	0.77
MOPA
6A	37	621 (229–1687)	42	1939 (1023–3674)	0.06
9V	7	9545 (3403–26771)	72	10276 (7183–14702)	0.90
14	13	4995 (2385–10458)	67	5458 (3720–8008)	0.85
19F	33	533 (250–1136)	48	729 (404–1317)	0.51
23F	25	687 (185–2551)	56	1811 (976–3358)	0.12

^aStudent's t test was used for statistical comparisons.