Table 2 Lability score correspond to certain EEG-vigilance stage in the respective EEG block (20 min EEG recording separated in 4 blocks of 5 min duration)
From: Test-retest reliability of brain arousal regulation as assessed with VIGALL 2.0
Lability Score | Lability level (criterion) | EEG block | Operational definition |
|---|---|---|---|
1 | level 1: less than 1/3 of all segments not classified as 0/A- or 0/A1-stages | 1-4 | rigidity, unique appearance of 0 and A1 |
2 | 1-4 | rigidity, unique appearance of 0 and A | |
3 | level 2: at least 1/3 of all segments classified as B (B1 + B2/3)-stages | 4 | stage B emerged in minute 16-20 |
4 | 3 | stage B emerged in minute 11-15 | |
5 | 2 | stage B emerged in minute 6-10 | |
6 | 1 | stage B emerged in minute 1-5 | |
7 | Level 3: at least 1/3 of segments classified as B2/3-stages | 4 | stage B2/3 emerged in minute 16-20 |
8 | 3 | stage B2/3 emerged in minute 11-15 | |
9 | 2 | stage B2/3 emerged in minute 6-10 | |
10 | 1 | stage B2/3 emerged in minute 1-5 | |
11 | Level 4: occurrence of at least 1 C-stage | 4 | stage C emerged in minute 16-20 |
12 | 3 | stage C emerged in minute 11-15 | |
13 | 2 | stage C emerged in minute 6-10 | |
14 | 1 | stage C emerged in minute 1-5 |