Abstract
Objectives: To design a Spanish questionnaire to assess quality
of life in chronicobstructive sialadenitis (COS), named CSOC and assess
its reliability, validity andfeasibility.
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 theinstrument 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.