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Table 1 Differences in numbers of samples classified as "sufficiently protected" (serumdilution vs. concentration C in IU/ml), n = 2564

From: Immunity status against poliomyelitis in Germany: Determination of cut-off values in International Units

Polio 1 C<C0 C>=C0
Serum dil.< 1/4 90 11
Serum dil.>=1/4 12 2451
Polio 2   
Serum dil.< 1/4 97 17
Serum dil.>=1/4 1 2449
Polio 3   
Serum dil.< 1/4 182 0
Serum dil.>=1/4 82 2300