Table 3.
Mean scores for the diagnostic questionnaires for the CFS/ME and FM groups and the number of participants who confirmed that they experienced each symptom in the past 6 months on the American CDC Symptom Inventory
| American CDC Symptom Inventory | CFS/ME | FM | ||||||||
| Variable | Mean Score | Yes n | Yes % | No n | No % | Mean Score | Yes n | Yes % | No n | No % |
| Sore throat | 3.79 | 77 | 76.2 | 24 | 23.8 | 3.59 | 82 | 76.6 | 25 | 23.4 |
| Tender lymph nodes | 4.60 | 81 | 80.2 | 20 | 19.8 | 4.25 | 83 | 77.6 | 24 | 22.4 |
| Fatigue after exertion | 12.43 | 101 | 100.0 | 0 | 0 | 12.99 | 106 | 99.1 | 1 | 0.9 |
| Muscle aches and pains | 9.51 | 95 | 94.1 | 6 | 5.9 | 13.79 | 107 | 100.0 | 0 | 0 |
| Joint pain | 7.78 | 85 | 84.2 | 16 | 15.8 | 11.48 | 105 | 98.1 | 2 | 1.9 |
| Unrefreshing sleep | 10.97 | 96 | 95.1 | 5 | 4.9 | 13.19 | 107 | 100.0 | 0 | 0 |
| Headaches | 6.27 | 93 | 92.1 | 8 | 7.9 | 9.96 | 95 | 88.8 | 12 | 11.2 |
| Memory and concentration problems | 9.37 | 96 | 95.1 | 5 | 4.9 | 9.62 | 104 | 97.2 | 3 | 2.8 |
| Total degree of distress | 64.72 | – | – | – | – | 75.87 | – | – | – | – |
| Number of pain points | 8.49 | – | – | – | – | 13.59 | – | – | – | – |
CDC, Centers for Disease Control and Prevention; CFS, chronic fatigue syndrome; FM, fibromyalgia; ME, myalgic encephalomyelitis.