. 2020 Jun 25;7(1):e000373. doi: 10.1136/lupus-2019-000373

Table 5.

FACIT-F: assessment of instrument properties in SLE

Author, year	Description of study	Reliability	Validity		Responsiveness and ability to detect change	MCID
Author, year	Description of study	Internal consistency	Test-construct/ Retest Discriminant	Known- groups	Responsiveness and ability to detect change	MCID
Furie et al, 2014³⁵	Secondary analysis of pooled data from the BLISS Trials in SLE (n=1684). Changes in clinical, laboratory and health-related quality of life measures from baseline to week 52 were compared between SRI responders and non-responders				✓
Strand et al, 2014⁵⁶	Secondary analysis of two phase III RCTs in SLE, including BLISS-52 (52 weeks’ duration, n=865) and BLISS-76 (76 weeks’ duration, n=819)		✓
Lai et al, 2011⁵²	Longitudinal validation study in SLE (n=254). The FACIT-F and other measures were administered at four time points from baseline to week 52	✓	✓	✓	✓	✓
Goligher et al, 2008⁵⁷	Cross-sectional study in SLE (n=80). Seven fatigue instruments administered to derive the MCID of the FACIT-F. Interviews were conducted to compare fatigue levels between participants		✓			✓

✓=Instrument property assessed in study.

FACIT-F, Functional Assessment of Chronic Illness Therapy-Fatigue Scale; MCID, minimal clinically important difference; SRI, SLE Responder Index.