Table 1.

Comparison of seroconversion rates or GMFRs in individuals with baseline IgG ≥ 1.3 µg/mL versus individuals with baseline IgG < 1.3 µg/mL.

Serotype	Pre-Vaccination IgG < 1.3 µg/mL			Pre-Vaccination IgG ≥ 1.3 µg/mL			p Value
	Number	Seroconversion Rate	GMFR	Number	Seroconversion Rate	GMFR	P1 a	P2 b
1	317	92.74	11.09	210	88.10	6.59	NS	<0.05
2	271	95.57	13.18	313	87.86	7.30	<0.05	<0.05
3	484	68.18	3.77	80	26.25	1.44	<0.05	<0.05
4	435	85.52	7.09	82	71.95	3.58	<0.05	<0.05
5	412	87.38	7.39	172	73.84	4.26	<0.05	<0.05
6B	212	79.72	5.17	351	72.36	3.72	NS	<0.05
7	280	92.86	11.44	283	86.93	6.21	<0.05	<0.05
8	118	94.07	10.70	439	82.69	5.15	<0.05	<0.05
9N	226	95.58	12.44	358	89.39	7.02	<0.05	<0.05
9V	193	87.56	5.91	383	81.46	4.23	NS	<0.05
10A	195	84.62	7.24	337	90.21	7.61	NS	NS
11A	168	88.69	6.20	385	74.55	3.58	<0.05	<0.05
12F	391	78.01	4.48	186	58.06	2.49	<0.05	<0.05
14	152	91.45	11.19	416	70.19	4.44	<0.05	<0.05
15B	85	95.29	9.35	484	83.88	5.11	<0.05	<0.05
17F	283	90.81	9.02	263	86.69	5.40	NS	<0.05
18C	213	92.49	8.34	334	82.63	4.43	<0.05	<0.05
19A	274	79.56	6.20	294	81.29	5.60	NS	NS
19F	128	88.28	4.96	433	72.98	3.62	<0.05	<0.05
20A	82	74.39	3.87	478	63.60	2.78	NS	<0.05
22F	334	87.72	7.87	135	71.11	4.35	<0.05	<0.05
23F	358	85.75	6.84	209	67.94	3.17	<0.05	<0.05
33F	93	93.55	13.50	466	92.06	7.42	NS	<0.05

a: Seroconversion rates of pre-vaccination IgG < 1.3 µg/mL vs. ≥ 1.3 µg/mL; b: GMFRs of pre-vaccination IgG < 1.3 µg/mL vs. ≥ 1.3 µg/mL.