Table 12.
Risk of febrile seizures in children 3–5 years old by month of year
| Month | Risk Ratio | 99% CI | P-value |
|---|---|---|---|
| January | 1.03 | 0.57, 1.83 | 0.91 |
| February | 1.28 | 0.74, 2.22 | 0.24 |
| March | 1.18 | 0.67, 2.07 | 0.45 |
| April (Reference) | 1.00 | – | – |
| May* | 1.77 | 1.06, 2.96 | < 0.0044 |
| June* | 2.87 | 1.78, 4.64 | < 0.0001 |
| July* | 2.56 | 1.58, 4.17 | < 0.0001 |
| August* | 3.49 | 2.18, 5.57 | < 0.0001 |
| September* | 3.00 | 1.86, 4.83 | < 0.0001 |
| October* | 1.74 | 1.04, 2.93 | 0.0056 |
| November* | 1.74 | 1.04, 2.93 | 0.0056 |
| December | 1.44 | 0.84, 2.46 | 0.083 |
Intercept denotes estimated number of febrile seizures in this age group in April. Statistically significant months are denoted with*. The baseline monthly number of febrile seizures for this subgroup was 3.9