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. 2009 Mar 20;5(3):e1000424. doi: 10.1371/journal.pgen.1000424

Table 3. Odds ratios for the protective effect of the rs231778 G allele in African Americans with RA.

OR 95% CI Fisher's Exact P value
Longitudinal 0.23 0.13–0.39 2.127×10−8
Cross-sectional 0.17 0.10–0.28 3.354×10−17
Combined 0.19 0.13–0.26 2.437×10−28

Analysis compares number of patients and controls for genotype AA vs those with either AG or GG in a 2×2 Fisher's exact test. OR – odds ratio; CI – confidence interval.