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Statistical analysis for the prevalence of H pylori genes or alleles in Costa Rican clinical isolates from groups A and B
| Gene/allele | Group A (n = 41, %) | Group B (n = 35, %) | OR (95% CI) | P-value |
| cagA | 36 (87.8) | 23 (65.7) | 3.9 (1.2-12.9) | 0.026 |
| vacA s1b | 36 (87.8) | 24 (68.6) | 3.6 (1.1-12.1) | 0.041 |
| vacA m1 | 33 (80.5) | 22 (62.9) | 2.7 (0.9-8.0) | 0.068 |
| babA2 | 19 (46.3) | 15 (42.9) | 1.1 (0.4-2.8) | 0.812 |
