Journal of Patient-Reported Outcomes

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**

^**p < 0.01
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 \({\text{SD}*}\sqrt {\left( {{{1 {-} \text{Cronbach}^{\prime}\text{s} \,\text{alpha}}}} \right)}\)

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