| Value | Code Name | Code | Code System | Code Description |
|---|---|---|---|---|
| Suppression | Suppression | Suppression (>90% of the record <10 microvolts) | ||
| Burst-attenuation / burst-suppression | Burst-attenuation / burst-suppression | Burst-attenuation / burst-suppression (50–90% attenuation or suppression) | ||
| Continuous | Continuous | Continuous | ||
| Nearly continuous | Nearly continuous | Nearly continuous (<10% attenuation [>10 microvolts but 50% of the background voltage] or suppression [<10 microvolts]) | ||
| Discontinuous | Discontinuous | Discontinuous (10–49% of attenuation or suppression) |