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Table 4 Distribution of antibody titers among cases and non cases of PF, and measure of association.

From: Pontiac fever: an operational definition for epidemiological studies

Antibody titers Number of subjects with Pontiac fever Number of subjects without Pontiac fever RR (and p*)
1/16 5 94 1.39 (0.34)
1/32 2 39 1.27 (0.49)
1/64 3 77 0.94 (0.61)
1/128 2 24 2.08 (0.27)
1/256 2 14 3. 45 (0.12)
1/512 0 6 p = 0.78
  1. * p value are from one-sided tests