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. Author manuscript; available in PMC: 2010 Aug 13.
Published in final edited form as: Vaccine. 2009 Jul 3;27(37):5091–5095. doi: 10.1016/j.vaccine.2009.06.057

Table 3.

Comparisons of geometric mean titer (GMT) at Day 0 and after the first vaccination and proportions with seroconversion 28 days after the first vaccination, for subjects with a baseline titer < 10 and those with baseline titer ≥ 10

Baseline Titer <10 Baseline Titer ≥ 10 P value
HAI N 540 56
Baseline GMT 5.0 38.1 <.0001*
Post Dose 1 GMT 7.8 94.0 <.0001*
Number (%) w/ 4-Fold Rise 60 (11) 21 (38) <.0001**
Neut N 509 87
Baseline GMT 5.2 25.4 <.0001*
Post Dose 1 GMT 8.0 49.6 <.0001*
Number (%) w/ 4-Fold Rise 32 (6.3) 21 (24) <.0001**
*

Wilcoxon rank test

**

Fisher's exact test