Table 3.
The final logistic regression formula for a subject's risk of electrographic seizure occurrence based on the above values is given by the formula: risk = ew/(1 + ew) where the linear predictor w = 0.9076*age (1=less than 24 months, 0= greater or equal to 24 months) + 0.8056*clinically evident seizures prior to CEEG (1=yes, 0=no) + 2.4334*slow and disorganized initial background (1=yes; 0=no) + 2.2239* discontinuous initial background (1=yes; 0=no) +3.0813*burst-suppression initial background (1=yes; 0=no) + 2.9661*attenuated/featureless initial background (1=yes; 0=no) +1.8272*interictal epileptiform discharges in the first hour of EEG (1=present,0= absent) – 4.5067. To avoid requiring the calculations in clinical use, the model score is calculated for each combination of variables using the logistic regression formula. Patients with model scores above an institution's pre-determined cut-off would undergo CEEG.
| Age | Clinically Evident Seizures Prior to CEEG | EEG Background Category | Interictal Epileptiform Discharges | Model Score |
|---|---|---|---|---|
| < 24 months | Yes | Slow and Disorganized | Yes | 0.8126 |
| < 24 months | Yes | Discontinuous | Yes | 0.7786 |
| < 24 months | Yes | Burst Suppression | Yes | 0.8924 |
| < 24 months | Yes | Attenuated and Featureless | Yes | 0.8808 |
| < 24 months | Yes | Slow and Disorganized | No | 0.4110 |
| < 24 months | Yes | Discontinuous | No | 0.3613 |
| < 24 months | Yes | Burst Suppression | No | 0.5715 |
| < 24 months | Yes | Attenuated and Featureless | No | 0.5430 |
| < 24 months | No | Slow and Disorganized | Yes | 0.6596 |
| < 24 months | No | Discontinuous | Yes | 0.6111 |
| < 24 months | No | Burst Suppression | Yes | 0.7874 |
| < 24 months | No | Attenuated and Featureless | Yes | 0.7675 |
| < 24 months | No | Slow and Disorganized | No | 0.2376 |
| < 24 months | No | Discontinuous | No | 0.2018 |
| < 24 months | No | Burst Suppression | No | 0.3734 |
| < 24 months | No | Attenuated and Featureless | No | 0.3468 |
| ≥ 24 months | Yes | Slow and Disorganized | Yes | 0.6363 |
| ≥ 24 months | Yes | Discontinuous | Yes | 0.5866 |
| ≥ 24 months | Yes | Burst Suppression | Yes | 0.7698 |
| ≥ 24 months | Yes | Attenuated and Featureless | Yes | 0.7488 |
| ≥ 24 months | Yes | Slow and Disorganized | No | 0.2197 |
| ≥ 24 months | Yes | Discontinuous | No | 0.1859 |
| ≥ 24 months | Yes | Burst Suppression | No | 0.3498 |
| ≥ 24 months | Yes | Attenuated and Featureless | No | 0.3241 |
| ≥ 24 months | No | Slow and Disorganized | Yes | 0.4388 |
| ≥ 24 months | No | Discontinuous | Yes | 0.3880 |
| ≥ 24 months | No | Burst Suppression | Yes | 0.5991 |
| ≥ 24 months | No | Attenuated and Featureless | Yes | 0.5712 |
| ≥ 24 months | No | Slow and Disorganized | No | 0.1117 |
| ≥ 24 months | No | Discontinuous | No | 0.0926 |
| ≥ 24 months | No | Burst Suppression | No | 0.1938 |
| ≥ 24 months | No | Attenuated and Featureless | No | 0.1764 |
CEEG, continuous EEG monitoring