Table 2.
The relationship between electroencephalographic (EEG) and clinical features and abnormal imaging findings.
| Clinical and EEG findings | Abnormal imaging findings n/N (%) | Normal imaging n/N (%) |
Univariable OR (95% CI) |
P-Value |
|---|---|---|---|---|
| Age ≤ 5 years | 52/133 (39%) | 81/133 (61%) | ||
| Age > 5 years | 43/155 (28%) | 112/155 (72%) | 1.67 (1.01, 2.76) | 0.04 |
| Presence of comorbidity | 35/66 (53%) | 31/66 (47%) | ||
| No documented comorbidity | 60/222 (27%) | 162/222 (73%) | 3.04 (1.70, 5.47) | <0.01 |
| Inter-ictal epileptiform EEG activity | 19/45 (42%) | 26/45 (58%) | ||
| No inter-ictal epileptiform EEG activity | 18/95 (19%) | 77/95 (81%) | 3.13 (1.39, 7.03) | <0.01 |
| EEG slowing | 7/17 (41%) | 10/17 (59%) | ||
| No documented EEG slowing | 30/123 (30%) | 93/123 (70%) | 2.17 (0.75, 6.28) | 0.14 |
| Asymmetrical EEG background | 3/7 (43%) | 4 (57%) | ||
| Symmetrical EEG background | 34/133 (26%) | 99/133(74%) | 0.46 (0.10, 2.17) | 0.31 |
OR, odds ratio.