Table 2. Preictal changes in the activity of different frequency bands across four separate contact subsets in the three patient subgroups.
| Percent change in frequency band activity from baseline to the immediate preictal section in four contact subsets | |||||
| Patient subgroup | Frequency band | Lesional/SOZ | Non-lesional/SOZ | Lesional/non-SOZ | Non-lesional/non-SOZ |
| Mesial temporal atrophy/sclerosis | Delta | 27.9%** | 25.0%** | 52.8%*** | 23.7%*** |
| Thetaa | 39.1%*** | 30.6%** | 59.0%** | 21.5%*** | |
| Alpha | 36.8%*** | 38.8%*** | 37.9%** | 24.2%*** | |
| Beta | 32.6%** | 31.9%** | 25.3%** | 10.6%*** | |
| Gammab | 18.5%* | 33.7%** | 17.2% | 7.1%*** | |
| Ripples | 110.0%** | 59.7% | 159.1% | 74.5%*** | |
| Fast ripplesc | 157.1%** | –3.5% | 41.9% | 44.6% | |
| Local/regional cortical atrophy | Delta | 10.1% | 15.2% | 15.8%** | 17.5%*** |
| Theta | –2.9% | 8.3% | 12.1% | 10.0%** | |
| Alpha | –16.4% | 13.5% | –6.7% | 6.3% | |
| Betad | –10.4% | 27.3% | –13.1%** | –2.0% | |
| Gammae | 0.2% | 23.7%* | 4.3% | 2.7% | |
| Ripples | 41.2% | 9.5% | 19.8% | 33.7% | |
| Fast ripples | –37.1% | –12.5% | 5.4% | –2.4% | |
| Malformations of cortical development | Delta | 20.3%* | 7.6% | 21.6%** | 23.9%*** |
| Theta | 26.3%*** | 18.4%* | 14.4%* | 14.7%*** | |
| Alpha | 18.0%** | 3.9% | 2.1% | 6.3%* | |
| Betaf | 17.4%*** | 12.9% | 4.8% | 5.0%** | |
| Gammag | 16.4%** | 4.2% | 2.5% | –0.2% | |
| Ripples | 39.3% | 47.9% | 32.0% | 9.1% | |
| Fast ripples | 9.6% | 20.7% | 8.5% | 4.2% | |
p<0.001; **p<0.01; *p≤0.05.
The preictal change in lesional/non-SOZ contacts was significantly different from that in non-lesional/non-SOZ contacts (Scheffe test; p = 0.05).
The preictal change in non-lesional/SOZ contacts was significantly different from that in non-lesional/non-SOZ contacts (Scheffe test; p<0.01).
The preictal change in lesional/SOZ contacts was significantly different from that in non-lesional/SOZ contacts, and from that in non-lesional/non-SOZ contacts (Scheffe test; both p<0.001).
The preictal change in non-lesional/SOZ contacts was significantly different from that in lesional/SOZ contacts, from that in lesional/non-SOZ contacts, and from that in non-lesional/non-SOZ contacts (Scheffe test; p<0.05, p<0.01 and p<0.05, respectively).
The preictal change in non-lesional/SOZ contacts was significantly different from that in non-lesional/non-SOZ contacts (Scheffe test; p<0.05).
The preictal change in lesional/SOZ contacts was significantly different from that in non-lesional/non-SOZ contacts (Scheffe test; p<0.05).
The preictal change in lesional/SOZ contacts was significantly different from that in lesional/non-SOZ contacts, and from that in non-lesional/non-SOZ contacts (Scheffe test; p<0.01 and p<0.001, respectively).