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Table 2 Spearman’s correlation coefficients (r s) with p values for correlation between change (posttest-baseline) in the five subscales of the Multidimensional Fatigue Inventory-20 and patient characteristics, symptoms and physical function (n = 105)

From: Resistance exercise improves physical fatigue in women with fibromyalgia: a randomized controlled trial

  Change in general fatigue r s, p value Change in physical fatigue r s, p value Change in mental fatigue r s, p value Change in reduced activity r s, p value Change in reduced motivation r s, p value
Age −0.09, 0.36 0.00, 0.98 0.01, 0.89 0.027, 0.78 0.033, 0.74
Employment 0.23, 0.021 0.26, 0.008 0.09, 0.35 0.11, 0.28 0.05, 0.62
Duration CWP 0.00, 0.98 −0.07, 0.47 0.04, 0.70 0.10, 0.33 0.10, 0.33
FIQ pain −0.17, 0.079 −0.14, 0.15 0.15, 0.12 −0.12, 0.23 0.02, 0.85
PCS total 0.02, 0.84 0.03, 0.80 0.02, 0.86 −0.04, 0.69 0.09, 0.39
HADS-D 0.00, 0.98 −0.02, 0.83 −0.12, 0.21 0.04, 0.70 −0.030, 0.76
HADS-A 0.06, 0.52 0.11, 0.26 −0.11, 0.28 0.14, 0.16 0.12, 0.24
PSQI      
Duration of sleep −0.02, 0.84 −0.06, 0.55 −0.09, 0.39 −0.06, 0.58 −0.10, 0.36
Sleep efficiency −0.21, 0.049 −0.21, 0.044 −0.21, 0.048 −0.06, 0.54 −0.22, 0.037
Sleep disturbance −0.03, 0.74 0.09, 0.39 0.04, 0.67 0.16, 0.12 0.04, 0.69
Sleep latency −0.15, 0.15 −0.05, 0.62 −0.05, 0.66 −0.08, 0.46 −0.07, 0.54
Day dysfunction 0.06, 0.52 0.03, 0.74 0.00, 0.95 −0.08, 0.40 0.14, 0.18
Sleep quality −0.03, 0.75 −0.02, 0.84 −0.05, 0.63 0.05, 0.63 0.14, 0.17
Need meds to sleep −0.14, 0.15 −0.08, 0.41 −0.11, 0.28 0.00, 0.99 0.03, 0.80
Total score −0.10, 0.31 −0.11, 0.30 −0.13, 0.20 −0.06, 0.53 −0.4, 0.67
LTPAI −0.09, 0.38 0.08, 0.44 −0.02, 0.83 0.11, 0.29 −0.04, 0.69
6-minute walk test 0.06, 0.53 0.10, 0.33 −0.09, 0.35 −0.04, 0.71 −0.13, 0.19
  1. Correlation coefficients with a p value <0.1 are marked in bold print. CWP chronic widespread pain, FIQ Fibromyalgia Impact Questionnaire, PCS Pain Catastrophizing Scale, HADS-D Hospital Anxiety and Depression Scale – subscale of depression, HADS-A Hospital Anxiety and Depression Scale – subscale of anxiety, PSQI Pittsburgh Sleep Quality Index, meds medications, LTPAI Leisure Time Physical Activity Instrument