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Participants with myalgic encephalomyelitis/chronic fatigue syndrome and the systemic exertion intolerance disease criteria
| Symptom | Yes | No |
| Less able to do normal things | 1404 (99%) | 14 (1%) |
| Worse after physical, mental or emotional activity | 1406 (99%) | 12 (1%) |
| Sleep unrefreshing/disturbed | 1364 (96.2%) | 54 (3.8%) |
| Brain fog | 1382 (97.5%) | 36 (2.5%) |
| Worse symptoms/dizziness when upright | 1103 (77.8%) | 315 (22.2%) |
