Table 2.
Polysomnographic characteristics in the participants
| Tension-type headache | ||||||
|---|---|---|---|---|---|---|
| Less than 12 days per year (n = 318) | 12–179 days per year (n = 105) | ≥180 days per year (n = 8) | ||||
| Mean | (SD) | Mean | (SD) | Mean | (SD) | |
| Total sleep time (min) | 404.3 | 77.5 | 423.3 | 97.1 | 439.8 | 73.9 |
| Sleep efficiency (%) | 82.8 | 11.0 | 83.8 | 13.5 | 88.6 | 7.5 |
| S1 of total sleep time (%) | 7.1 | 6.9 | 5.9 | 6.9 | 4.4 | 2.9 |
| S2 of total sleep time (%) | 52.5 | 10.7 | 53.0 | 9.5 | 46.0 | 6.6 |
| S3 of total sleep time (%) | 6.9 | 3.6 | 5.9 | 3.2 | 6.9 | 3.1 |
| S4 of total sleep time (%) | 16.2 | 7.5 | 16.9 | 7.5 | 20.0 | 4.4 |
| REM of total sleep time (%) | 17.7 | 6.2 | 18.9 | 6.2 | 22.7 | 5.4 |
| Sleep latency (min) | 38.7 | 73.7 | 44.8 | 89.6 | 79.4 | 86.3 |
| REM latency from sleep onset (min) | 116.4 | 65.6 | 125.8 | 75.0 | 76.8 | 40.6 |
| Arousalindex | 17.9 | 13.4 | 16.1 | 14.0 | 12.7 | 6.4 |
| Apnea hypopnoea index (AHI) | 16.0 | 19.3 | 10.7 | 17.7 | 10.5 | 8.1 |
| Oxygen desaturation index (ODI) | 15.4 | 18.2 | 11.0 | 17.0 | 11.7 | 9.9 |
| Average oxygen saturation (%) | 94.2 | 1.9 | 94.9 | 1.7 | 94.9 | 0.9 |
| Lowest oxygen saturation (%) | 84.3 | 6.3 | 85.7 | 7.2 | 85.3 | 4.0 |
| Average desaturation (%) | 5.4 | 1.6 | 5.1 | 1.4 | 5.1 | 0.9 |