Observed | |||
Fatigued (CFQ≥4) | Not fatigued (CFQ<4) | CFQ-score (95 % CI) | |
Prediction | |||
Likely fatigued* (%) | 14 (66.7) | 7 (33.3) | 5.6 (3.9 to 7.3) |
Unsurely fatigued* (%) | 22 (61.1) | 14 (38.9) | 4.8 (3.7 to 5.8) |
Not fatigued* (%) | 40 (38.5) | 64 (61.5) | 3.2 (2.7 to 3.8) |
Sensitivity†=18.4% | Specificity†=75.3% |
*Referring medical practitioner’s guess; no=not fatigued, don’t know=unsurely fatigued, yes=likely fatigued.
†Sensitivity and specificity are calculated after an intention-to-diagnose principle5; when calculating sensitivity, unsurely fatigued is included in the false negatives, while in calculation of specificity those predicted unsurely fatigued is included in false positives.
CQF, Chalder Fatigue Questionnaire.