Table 6.

Potency estimates for U.S. reference reagent Vi-IgG_{R1, 2011}, the coded duplicate of 16/138 and 10/126 relative to 16/138.

Method	Lab code	Sample C (16/138)	Vi-IgG_{R1, 2011}	Sample A (10/126)
VaccZyme ELISA	1	0.70	1.60	0.84
	2	0.97	2.02	1.04
	3	1.01	1.60	1.18
	4	1.08	1.59	1.09
	5	0.94	1.39	1.23
	6	1.22	1.63	1.21
In-house ELISA	1	1.04	1.88	0.93
	4	1.01	1.89	1.17
	5	0.90	1.70	1.09
GM^a by VaccZyme ELISA (95% CI^b)			1.63 (1.44–1.85)	1.09 (0.94–1.27)
GM by all ELISAs (95% CI)			1.69 (1.55–1.85)	1.08 (0.98–1.19)
GM by VaccZyme ELISA based on potency relative to both 16/138 and sample C ⁽95% CI)			1.65 (1.41–1.92)	1.10 (1.01–1.21)
GM by all ELISAs based on potency relative to both 16/138 and sample C ⁽95% CI)			1.71 (1.55–1.89)	1.09 (1.01–1.18)

Geometric Mean.

Confidence Interval.