Table 1.

Reliability (Internal Consistency, Reliability & Measurement Error) Findings Based on Each Measure

Authors (Date)	Measure	Reliability (Cronbach’s Alpha)	Internal consistency (Inter-Item Correlations)	Test-test Reliability	Measurement error
Moran & Mohr (2005) [39]	BDI				BDI SEM = 3.26; HRSD SEM = 3.20
Aikens et al. (1999) [24]	BDI-II	Full BDI α = .86, Cognitive / Affective α = .85 Somatic α = .64 BDI-18 α = .84
Amtmann et al. (2014) [33]	PHQ-9; CESD-10; PROMIS-D-8		PHQ-9 = .35-.67; CESD-10 = .33-.67; PROMIS-D-8 = .75-.84
Sjonnesen et al. (2012) [46]	PHQ-9	α = .82	Item-total correlations (PwMS): anhedonia (.71); depressed mood (.65); fatigue (.57) and concentration (.55).
Chang et al. (2003) [37]	CMDI	Sleep Disturbance α = .64 Cognitive Inefficiency α = .86 Fatigue α = .94 Evaluative α = .82 Mood α = .95
Solari et al. (2003) [49]	CMDI	MS Vegetative α = .88 Evaluative α = .7 Mood α = .93	Item-subscale: mood = .58-.80, evaluative = .37-.70, vegetative = .32-.57	ICC = 0.78 (95 % CI 0.62–0.89); Subscales range 0.71–0.79 (2 weeks)
Patten et al. (2010) [45]	CES-D			r = .69 over 1 year; r = .70 over 2 years; r = .65 over 3 years; r = .73 year 1-year 2; r = .73 year 2-year 3
Verdier-Taillefer et al. (2001) [48]	CES-D	α = .90

Note: HRSD = Hamilton Rating Scale for Depression