Table 2: Proportional Reporting Ratios (PRR) analysis. Evans, et al. criteria for signal detection: PRR ≥ 2, the χ2 ≥ 4, and the number of individual cases ≥ 3.4 ITP, idiopathic thrombocytopenic purpura.
| PRR (CI 95%) | χ2 with Yates correction | Meets Evans, et al. criteria? | ||
| Anaphylaxis | 1.372 (1.099-1.712) | 7.550 | 130 | No |
| Febrile Seizures | 1.182 (1.106-1.263) | 24.401 | 1390 | No |
| Encephalitis | 1.441 (1.094-1.897) | 6.459 | 86 | No |
| Orchitis | 3.375 (1.811-6.292) | 15.240 | 26 | Yes |
| Severe Orchitis | 0.940 (0.085-10.362) | 0.000 | 1 | No |
| ITP | 1.501 (1.077-2.093) | 5.407 | 60 | No |