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Table 1 Correlates of fatigue

From: Beyond pain in fibromyalgia: insights into the symptom of fatigue

Correlate Design and sample Direction
Pain 4 cross-sectional [5, 3133] Positive
6 longitudinal (5 months, 30 days, 10 days, 6 days) [21, 22, 28, 29, 3436]
Sleep duration 1 longitudinal (30 days) [34] Negative
Sleep quality 2 longitudinal (6 days, 3 days) [21, 37] Negative
Sleep disturbance 1 cross-sectional [5] Positive
1 longitudinal (30 days) [29, 35]
Anxiety and depression 5 cross-sectional [5, 31, 3840] Positive
4 longitudinal (5 months, 30 days, 6 days) [21, 22, 29, 34, 35]
Tenderness 2 cross-sectional [5, 38] Positive
Stiffness 1 cross-sectional [33] Positive
1 longitudinal (10 days) [28]
Disability 2 cross-sectional [5, 33] Positive
Cognitive complaints 1 cross-sectional [41] Positive
Gastrointestinal distress 1 cross-sectional [5] Positive
Negative events 1 longitudinal (30 days) [35] Positive
Positive events 1 longitudinal (30 days) [35] Negative same day, positive following day
Positive affect 1 cross-sectional [42] Negative
1 longitudinal (30 days) [29]
Negative affect 1 longitudinal (30 days) [29] Positive
Internal locus of control 1 cross-sectional [43] Negative
External locus of control 1 cross-sectional [43] Negative
Emotional distress 1 longitudinal (30 days) [36] Positive
Fibromyalgia severity 2 cross-sectional [5, 44] Positive