C3H mouse potency (ED50) testing versus the licensed thiomersal-containing vaccine
“In-vivo potency testing in C3H mice showed the thiomersal-free vaccine to be highly potent and comparable to that of the thiomersal-containing formulation.”
Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reviewer's view of the efficacy data
Mouse immunogenicity at least equivalent, but extrapolation to humans is controversial
“The comparative mouse immunogenicity test performed with the hepatitis B vaccine with and without thiomersal indicates that there is at least equivalent immunogenicity of both products. However, it is controversial to what extent these data can be extrapolated to humans.”