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

Journal of Patient-Reported Outcomes

Table 4 Additional psychometric values for fatigue measures

	MBSR trials (N = 106)				BEAT Cancer trial (N = 222)				Average across trials
	FSI Total	FSI Severity	FSI Interference	FSI-3	FSI Total	FSI Severity	FSI Interference	FSI-3	FSI Total	FSI Severity	FSI Interference	FSI-3
Global change (better vs same)	0.98	0.90	1.10	0.98	1.24	1.39	1.13	1.69	1.11	1.14	1.12	1.33
Coefficient of Repeatability	1.18	1.75	1.63	2.20	1.10	1.76	1.45	2.17	1.14	1.76	1.54	2.19
0.2 SD	0.32	0.29	0.39	0.37	0.37	0.38	0.41	0.44	0.34	0.34	0.40	0.40
0.35 SD	0.55	0.51	0.68	0.64	0.65	0.67	0.71	0.77	0.60	0.59	0.69	0.71
0.5 SD	0.79	0.73	0.97	0.92	0.93	0.95	1.01	1.10	0.86	0.84	0.99	1.01
1 SEM	0.43	0.63	0.59	0.79	0.40	0.63	0.52	0.78	0.41	0.63	0.55	0.79
2 SEM	0.85	1.27	1.18	1.59	0.79	1.27	1.04	1.56	0.82	1.27	1.11	1.58

MBSR = Mindfulness-based stress reduction. BEAT Cancer trial = Better Exercise Adherence after Treatment for Cancer trial. FSI = Fatigue Symptom Inventory
SD = Standard deviation of the baseline scores. SEM = Standard error of measurement of the baseline scores
“Better” refers to the group whose SF-36 Vitality scores increased by ≥ 1 SEM. “Same” refers to the group whose change in SF-36 Vitality scores was < 1 SEM. The best MID estimate was derived from triangulating three summary results (mean, median, and upper value of range excluding highest and lowest MID) and rounding to an integer value