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. Author manuscript; available in PMC: 2014 Jun 7.
Published in final edited form as: Vaccine. 2013 Apr 11;31(25):2756–2761. doi: 10.1016/j.vaccine.2013.03.065

Figure 2.

Figure 2

Pre-vaccination anti-Vi serum IgG versus unadjusted change statistics. (A) Fold change (Day 28/Day 0) versus Day 0 antibody levels. Correlation between log10 (fold change) and pre-vaccination levels = −0.35; p < 0.001) suggests that fold change is negatively dependent on pre-vaccination levels. Dark dots indicate lowest residual values (using log10 values in model). (B) Absolute change (Day 28 - Day 0) versus Day 0 antibody levels. Correlation between log10 (absolute difference) and pre-vaccination levels (r = 0.63; p < 0.001) suggests that absolute change is positively dependent on pre-vaccination levels. Dark dots indicate lowest residual values (using log10 values in model).