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Table 1 Descriptive psychometrics and correlations among the fatigue scales at baseline

From: Comparative responsiveness and minimally important difference of Fatigue Symptom Inventory (FSI) scales and the FSI-3 in trials with cancer survivors

Trials Descriptive Psychometrics Correlations
  Mean (SD) Min Max α SEM FSI
Total
FSI
Severity
FSI
Interference
FSI-3
MBSR (N = 106)
 FSI Total 5.06 (1.58) 0.54 8.00 0.93 0.43    
 FSI Severity 5.25 (1.46) 1.00 8.50 0.81 0.63 0.81**   
 FSI-Interference 4.79 (1.94) 0.00 8.71 0.91 0.59 0.97** 0.64**  
 FSI-3 5.47 (1.83) 0.67 9.33 0.81 0.79 0.93** 0.75** 0.90**
 SF-36 Vitality 32.41 (15.90) 0.00 75.00 0.74 8.05 − 0.57** − 0.44** − 0.53** − 0.50**
BEAT (N = 222)
 FSI Total 3.85 (1.86) 0.92 8.92 0.95 0.40    
 FSI Severity 4.58 (1.91) 1.00 9.25 0.89 0.63 0.90**   
 FSI-Interference 3.38 (2.03) 1.00 9.29 0.93 0.52 0.96** 0.76**  
 FSI-3 4.13 (2.19) 1.00 10.00 0.87 0.78 0.97** 0.87** 0.94**
 SF-36 Vitality 51.23 (20.22) 0.00 87.50 0.84 8.08 − 0.79** − 0.72** − 0.75** − 0.78**
  1. **p < 0.01
  2. MBSR = Mindfulness-based stress reduction. BEAT Cancer trial = Better Exercise Adherence after Treatment for Cancer trial. FSI = Fatigue Symptom Inventory. SF-36 Vitality = Short Form-36 Vitality subscale. SEM = Standard error of measurement, calculated as \({\text{SD}*}\sqrt {\left( {{{1 {-} \text{Cronbach}^{\prime}\text{s} \,\text{alpha}}}} \right)}\)