| Value (%) | |
|---|---|
| Analgesic effect onset (hours) | |
| 0 | 9 (15.0) |
| 0–0.5 | 10 (16.7) |
| 0.5–1 | 10 (16.7) |
| 1.0–2.0 | 5 (8.3) |
| >2 | 26 (43.3) |
| Duration of the analgesic effect (hours) | |
| 0–6 | 2 (3.4) |
| 6–12 | 4 (6.7) |
| 12–24 | 18 (30.0) |
| 24–48 | 26 (43.3) |
| 48–72 | 4 (6.7) |
| >72 | 6 (10.0) |
| Alterations in EA analgesic effect at random treatment sessions | |
| Increase | 30 (50.0) |
| Unchanged | 19 (31.7) |
| Decrease | 11 (18.3) |