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. Author manuscript; available in PMC: 2019 Apr 1.
Published in final edited form as: Aliment Pharmacol Ther. 2018 Jan 29;47(7):1001–1011. doi: 10.1111/apt.14531

Table 2.

Reliability of the HIT-6, PROMIS short forms, and HCV-PRO (N=961)

Measure N Items Alphaa 95% C.I.b N Floor (%)c Ceiling (%)c
HIT-6 scored 944 6 0.93 [0.92, 0.94] 944 30.9 0.2
PROMIS T-scoresd
 Fatigue 941 7 0.87 [0.86, 0.88] 960 1.6 0.2
 Pain Interference 944 8 0.98 [0.98, 0.98] 961 36.7 3.9
 Sleep Disturbance 945 8 0.94 [0.93, 0.95] 960 6.8 2.5
 Depression 942 8 0.96 [0.95, 0.96] 960 33.9 0.7
 Cognitive Concerns 940 8 0.96 [0.96, 0.97] 961 30.1 1.4
 Anger 958 5 0.91 [0.91, 0.92] 961 18.3 1.0
 Anxiety 954 4 0.91 [0.90, 0.92] 954 40.0 0.6
 Belly Paine 470 6 0.87 [0.85, 0.89] 960 49.7 0.1
 Diarrheae 388 6 0.88 [0.87, 0.90] 948 58.5 0.3
 Nausea/Vomitinge 452 4 0.63 [0.58, 0.69] 949 52.4 0.1
HCV-PROf 887 16 0.94 [0.94, 0.95] 887 0.1 5.9

Note:

a

Cronbach’s alpha coefficient.

b

95% confidence interval (C.I.) for Cronbach’s alpha.

c

Proportion of responses at the minimum (floor) or maximum (ceiling) of the scale.

d

Higher values of HIT-6 and PROMIS T-scores indicate more severe symptoms.

e

Only patients who reported presence of the symptom were analyzed.

f

Shown for reference in examining the properties of the HIT-6 and PROMIS scores. Higher values of HCV-PRO score indicate higher functional well-being.