Validation of a Spanish Chronic Obstructive Sialadenitis Quality of Life
Questionnaire
Abstract
Objectives: To design a Spanish questionnaire to assess quality of life
in chronic obstructive sialadenitis (COS), named CSOC and assess its
reliability, validity and feasibility. Design: A prospective,
multicentre, observational study Settings: Salivary Gland Disorder and
Sialendoscopy Unit, University Tertiary Hospital. Participants: Patients
with diagnosis of COS and indication for sialendoscopy were included in
the study. Main outcome measures: The item generation process included a
review of published data as well as interviews with patients. An expert
panel then tested the content validity of the instrument and the
construct validity was tested in 120 patients. Patients completed a
self-administered CSOC questionnaire, a Short Form-36 and a Visual
Analogue Scale. Feasibility, reliability, internal consistency,
construct validity and responsiveness were assessed. Results: All the
patients found the instrument understandable. Cronbach α coefficient was
high (0.85). The time required to fill out was 5.7 and 4.5 minutes for
pre and postsialendoscopy CSOC respectively. Cronbach α coefficient was
very high for both pre and postsialendoscopy CSOC (0.90 and 0.94
respectively). The correlation with the SF-36 dimensions was negative
and positive with the VAS. The mean score of CSOC was 28.6 and 7.98 for
pre and postsialendoscopy Conclusions: The CSOC questionnaire is
understandable, feasible, reliable and representative of quality of life
in COS. Keywords: sialadenitis, QOL, questionnaire, validation,
sialendoscopy