Table 4.
RisK of mild febrile seizures by month of year
| Month | Risk Ratio | 99% CI | P-value |
|---|---|---|---|
| January | 0.72 | 0.56, 0.93 | 0.001 |
| February | 0.80 | 0.63, 1.03 | 0.023 |
| March | 0.89 | 0.70, 1.13 | 0.21 |
| April (Reference) | 1.00 | – | – |
| May* | 1.33 | 1.07, 1.65 | 0.0008 |
| June* | 1.67 | 1.36, 2.06 | < 0.0001 |
| July* | 1.76 | 1.44, 2.17 | < 0.0001 |
| August* | 1.92 | 1.57, 2.35 | < 0.0001 |
| September* | 1.85 | 1.51, 2.26 | < 0.0001 |
| October* | 1.27 | 1.02, 1.58 | 0.0053 |
| November | 1.09 | 0.86, 1.36 | 0.35 |
| December | 1.05 | 0.83, 1.32 | 0.59 |
Intercept denotes estimated number of mild febrile seizures in April. Statistically significant months are denoted with *. The baseline monthly number of febrile seizures for this subgroup was 24.4