Experience and measurement of fatigue in adults with Crohn’s disease: results from qualitative interviews and a longitudinal 2-week daily diary pilot study

Journal of Patient-Reported Outcomes

Table 7 FACIT-F test–retest reliability, Days 1 and 7, based on PGIS-fatigue

FACIT-F^a	N	Day 1 mean (SD)	Day 7 mean (SD)	Difference score^b	t-value	p value^c	ES	ICC
Total score—overall sample	43	30.07 (13.51)	31.05 (14.12)	0.98	1.14	0.2595	0.07	0.92

^aAmong patients who had same PGIS-Fatigue scores at Day 1 and Day 7
^bCalculated as the Day 7 mean score minus the Day 1 mean score
^cPaired t-tests comparing responses at Day 1 and Day 7
ES, effect size; FACIT-F, Functional Assessment of Chronic Illness Therapy–Fatigue; ICC, intraclass correlation coefficient; PGIS, Patient Global Impression of Severity; SD, standard deviation