Online Self-Report Questionnaire on Computer Work-related Exposure (OSCWE): Validity and Internal Consistency
Keerin Mekhora PhD*, Wattana Jalayondeja PhD*, Chutima Jalayondeja DrPH*, Petcharatana Bhuanantanondh PhD*, Asadang Dusadiisariyavong MD**, Rujiret Upiriyasakul MSc*, Khajornyod Anuraktam BSc*
Affiliation : * Faculty of Physical Therapy, Mahidol University, Nakhon Pathom, Thailand ** Medical and Occupational Health, PTT Exploration and Production Public Company Limited, Bangkok, Thailand
Objective : To develop an online, self-report questionnaire on computer work-related exposure (OSCWE) and to determine
the internal consistency, face and content validity of the questionnaire.
Material and Method: The online, self-report questionnaire was developed to determine the risk factors related to
musculoskeletal disorders in computer users. It comprised five domains: personal, work-related, work environment, physical
health and psychosocial factors. The questionnaire’s content was validated by an occupational medical doctor and three
physical therapy lecturers involved in ergonomic teaching. Twenty-five lay people examined the feasibility of computer-
administered and the user-friendly language. The item correlation in each domain was analyzed by the internal consistency
(Cronbach’s alpha; α).
Results : The content of the questionnaire was considered congruent with the testing purposes. Eight hundred and thirty-five
computer users at the PTT Exploration and Production Public Company Limited registered to the online self-report questionnaire.
The internal consistency of the five domains was: personal (α = 0.58), work-related (α = 0.348), work environment (α =
0.72), physical health (α = 0.68) and psychosocial factor (α = 0.93).
Conclusion : The findings suggested that the OSCWE had acceptable internal consistency for work environment and
psychosocial factors. The OSCWE is available to use in population-based survey research among computer office workers.
Keywords : Online self-report questionnaire, Musculoskeletal disorder, Computer user
