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. Author manuscript; available in PMC: 2016 Sep 1.
Published in final edited form as: J Causal Inference. 2015 Feb 1;3(2):157–175. doi: 10.1515/jci-2014-0007

Figure 1.

Figure 1

For vaccine and placebo recipients in the immunological sub-study of ZEST (chosen as a 10% simple random sample, n=1218 vaccine and n=1273 placebo), the (A) boxplots depict the distribution of S|Yτ = 0, the log10 fold-rise of gpELISA antibody titers from baseline (Day 1; pre-immunization) to week 6. Data points are shown for random samples of 100 participants. (B) shows the association between S|Yτ = 0 and baseline gpELISA antibody titers (the BIP) in the vaccine group.