PBC-40
|
Construct validity
Moderate to high correlations with the SF-36 and ESI-55 scales, except
for “Physical functioning” domain of the SF-36 and “Itch” domain of
the PBC-40[17]
|
Internal consistency
Cronbach’s alpha >0.7 for all
scales[13]
Cronbach’s alpha >0.7 for all
scales[14]
Cronbach’s alpha >0.7 for all
scales[17]
Test‐retest
ICC ranged 0.83-0.96[17]
|
Floor and ceiling effects
There were no ceiling effects but there was a noticeable floor effect in
the
itch domain (36.7%)[15]
|
|
PBC-27
|
Convergent validity
minor correlations
between the PBC-27 social factor and the SF-36 social functioning, but
moderate to high correlations in majority of
scales[12]
|
Internal consistency
Cronbach’s alpha >0.7 for all
scales[12]
Cronbach’s alpha >0.7 for all scales, except for domains
“Dryness”, “Symptoms” and “Fatigue”
[13]
|
|
|
PBC-10
|
Content validity
Generally good, developed by hepatology experts in
PBC[15]
|
Internal consistency
Internal consistency was excellent with
Cronbach’s alpha of 0.936.
Test‐retest
ICC=0.945 for all scales[15]
|
Floor and ceiling effects
There were no ceiling effects but a floor
effect was obvious[15]
responsiveness ratio of 0.38, effect size of 0.39 and
standardised response mean of 1.25.
Responsiveness
Small to moderate responsiveness[15]
|
The minimal import‐
ant difference was 3.539[15]
|
NIDDK-QA
|
Concurrent validity
Small to high correlations with the SF-36 scales, P <0
.01[16]
|
Internal consistency
Cronbach’s alpha ranged from 0.87 to 0.94
Test‐retest
Pearson coefficients: 0.82-0.99,
P <0 .01[16]
|
|
|