Variable | Affected twins | Unaffected co-twins | Statistical comparison |
---|---|---|---|
Met criteria for chronic fatigue syndrome | 32/45, 71% | 0/45, 0% | By design |
Met criteria for idiopathic chronic fatigue | 13/45, 29% | 0/45, 0% | By design |
Female sex | 40/45, 89% | 40/45, 89% | Identical by design |
Median age at evaluation, IQR | 51, 39-59 years | 51, 39-59 years | Identical by design |
Median body mass index, IQR | 25, 22-30 kg/m2 | 24, 22-31 kg/m2 | Paired t44 = 0.1, p = 0.91 |
Median SF-36 physical function, IQR | 41, 27-48 | 48, 39-52 | Paired t44 = 3.1, p = 0.003 |
Median SF-36 mental function, IQR | 39, 29-48 | 51, 39-56 | Paired t44 = 4.7, p = 3 × 10-5 |
Median current fatigue by VAS, IQR | 69, 49-77 | 19, 10-51 | Paired t43 = -7.2, p = 6 × 10-9 |