Table 1.
Overview of normal variants.
| Normal variant | Nr in total | % of all recordings | Gender |
Median age (years) (range) |
Observed in recordings considered |
|||
|---|---|---|---|---|---|---|---|---|
| Male (%) | Female (%) | Normal (%) |
No definite abnormality (%) | Abnormal *(%) | ||||
| Sharp transients incl. wicket spikes | 586 | 19.21 | 39.77 | 60.23 | 28 (1–89) |
55 (9.39) |
247 (42.15) |
284 (48.46) |
| RTTD | 184 | 6.03 | 42.39 | 57.61 | 30 (3–80) |
88 (47.83) |
42 (22.83) |
5 (29.34) |
| Temporal slowing of the old | 88 | 2.89 | 48.86 | 51.14 | 68 (49–86) |
21 (23.86) |
55 (62.50) |
12 (13.64) |
| Slow fused transients | 79 | 2.59 | 44.30 | 55.70 | 16 (1–37) |
23 (29.11%) |
30 (37.97%) |
26 (32.92) |
| 14-and 6-Hz bursts | 56 | 1.83 | 53.57 | 46.43 | 13 (3–59) |
17 (30.36) |
11 (19.64) |
28 (50) |
| Breach rhythm | 38 | 1.25 | 36.84 | 63.16 | 40 (2–82) |
3 (7.89) |
5 (13.16) |
30 (78.95) |
| Small sharp spikes | 32 | 1.05 | 56.25 | 43.75 | 38 (10–80) |
8 (25.00) |
8 (25.00) |
16 (50.00) |
| 6-Hz spike and slow wave | 21 | 0.69 | 33.33 | 66.67 | 16 (1–66) |
2 (9.52) |
14 (66.67) |
5 (23.81) |
| SREDA | 1 | 0.03 | 100.00 | 0 | 39 (39) |
0 (0%) |
1 (100%) |
0 (0%) |
*
Recordings containing abnormal EEG findings other than the normal variants.