Table 4.

Correlates of Seronegativity for Assays with >10% Seronegativity Overall.

	HPV-18 LIA-4 (N=510)		HPV-18 GST-L1 (N=509)
	%	N	%	N
Overall	17.3	88	13.6	69
Covariate:
Study
CVT	5.6	15	11.1	30
INDIA	30.4	73	16.3	39
	* p-value: <0.001		* p-value: 0.087
Dosage Schedule
Single Dose Group	44.1	75	28.8	49
Reduced Dose Group	5.9	10	5.3	9
Full Dose Group	1.8	3	6.5	11
	* p-value: <0.001		* p-value: <0.001
Age at Vaccination (years)
9–12	28.6	30	13.3	14
13–16	30.2	32	14.2	15
17–21	8.4	17	14.9	30
22–25	9.3	9	10.3	10
	* p-value: <0.001		* p-value: 0.75
Time Since First Vaccine Dose (months)
<20	12.6	13	8.7	9
20–24	19.7	36	10.9	20
25+	17.4	39	17.9	40
	* p-value: 0.32		* p-value: 0.034

^*P-value calculated from chi-squared test.

Abbreviations: number (N); 4-plex Luminex immunoassay (LIA-4); and glutathione S-transferase L1 assay (GST-L1).