Table 10.
Risk of febrile seizures in children 1–2 years old by month of year
| Month | Risk Ratio | 99% CI | P-value |
|---|---|---|---|
| January* | 0.65 | 0.49, 0.86 | < 0.0001 |
| February | 0.78 | 0.60, 1.02 | 0.17 |
| March | 0.92 | 0.71, 1.18 | 0.38 |
| April (Reference) | 1.00 | – | – |
| May* | 1.33 | 1.05, 1.67 | 0.0018 |
| June* | 1.68 | 1.34, 2.10 | < 0.0001 |
| July* | 1.80 | 1.44, 2.24 | < 0.0001 |
| August* | 1.91 | 1.54, 2.37 | < 0.0001 |
| September* | 1.85 | 1.49, 2.30 | < 0.0001 |
| October* | 1.37 | 1.09, 1.73 | 0.00042 |
| November | 1.06 | 0.83, 1.35 | 0.54 |
| December | 1.16 | 0.92, 1.48 | 0.10 |
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 21.9