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Reliability and Validity of the Visual, Musculoskeletal, and Balance Complaints Questionnaire
Örebro University, School of Law, Psychology and Social Work.ORCID iD: 0000-0002-6703-7575
Örebro University, School of Medical Sciences. The Low Vision Center, Region Örebro County, Örebro, Sweden .ORCID iD: 0000-0002-6364-2145
Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, Centre for Musculoskeletal Research, University of Gävle, Gävle, Sweden .
2016 (English)In: Optometry and Vision Science, ISSN 1040-5488, E-ISSN 1538-9235, Vol. 93, no 9, p. 1147-1157Article in journal (Refereed) Published
Abstract [en]

Purpose: To evaluate the reliability and validity of the 15-item Visual, Musculoskeletal, and Balance Complaints Questionnaire (VMB) for people with visual impairments, using confirmatory factor analysis (CFA) and with Rasch analysis for use as an outcome measure.

Methods: Two studies evaluated the VMB. In Study 1, VMB data were collected from 1249 out of 3063 individuals between 18 and 104 years old who were registered at a low vision center. CFA evaluated VMB factor structure and Rasch analysis evaluated VMB scale properties. In Study 2, a subsample of 52 individuals between 27 and 67 years old with visual impairments underwent further measurements. Visual clinical assessments, neck/scapular pain, and balance assessments were collected to evaluate the convergent validity of the VMB (i.e. the domain relationship with other, theoretically predicted measures).

Results: CFA supported the a priori three-factor structure of the VMB. The factor loadings of the items on their respective domains were all statistically significant. Rasch analysis indicated disordered categories and the original 10-point scale was subsequently replaced with a 5-point scale. Each VMB domain fitted the Rasch model, showing good metric properties, including unidimensionality (explained variances ≥66% and eigenvalues <1.9), person separation (1.86 to 2.29), reliability (0.87 to 0.94), item fit (infit MnSq's >0.72 and outfit MnSq's <1.47), targeting (0.30 to 0.50 logits), and insignificant differential item functioning (all DIFs but one <0.50 logits) from gender, age, and visual status. The three VMB domains correlated significantly with relevant visual, musculoskeletal, and balance assessments, demonstrating adequate convergent validity of the VMB.

Conclusions: The VMB is a simple, inexpensive, and quick yet reliable and valid way to screen and evaluate concurrent visual, musculoskeletal, and balance complaints, with contribution to epidemiological and intervention research and potential clinical implications for the field of health services and low vision rehabilitation.

Place, publisher, year, edition, pages
Philadelphia, USA: Lippincott Williams & Wilkins, 2016. Vol. 93, no 9, p. 1147-1157
Keywords [en]
Visual complaints, musculoskeletal complaints, balance complaints, reliability, validity, confirmatory factor analysis, Rasch analysis, ergonomy
National Category
Ophthalmology
Identifiers
URN: urn:nbn:se:oru:diva-50953DOI: 10.1097/OPX.0000000000000902ISI: 000383908700021PubMedID: 27309524Scopus ID: 2-s2.0-84975166324OAI: oai:DiVA.org:oru-50953DiVA, id: diva2:939892
Note

Funding Agencies:

REHSAM Research Program at the Swedish Social Insurance Agency 99368-2009/RS11

Swedish Council for Working Life & Social Research 2009-1761

Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2018-04-20Bibliographically approved
In thesis
1. Visual, musculoskeletal, and balance symptoms in people with visual impairments
Open this publication in new window or tab >>Visual, musculoskeletal, and balance symptoms in people with visual impairments
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Worldwide, about 300 million people have some kind of visual impairment (VI). Most people with VI are in the older age range, as visual deficits increase with age. It is not unusual that people with VI suffer both from neck pain or scapular area symptoms and reduced balance, which they consider to be symptoms of old age. However, their symptoms may not be attributable to age, but rather to poor vision.

Aims: First, to identify associations between visual, musculoskeletal and balance symptoms in people engaging in near work every day and in people with VI. Second, to design and validate a suitable instrument for gathering information about visual, musculoskeletal and balance symptoms in people with VI. Third, to explore differences in perceived symptoms between VI patients and people with normal vision in cross-sectional studies and by following a group of age-related macular degeneration (AMD) patients in a longitudinal study. Fourth, to identify the most specific predictors of higher levels of visual, musculoskeletal and balance symptoms.

Methods: A specific instrument was developed: the Visual, Musculoskeletal and Balance symptoms (VMB) questionnaire. Patients with VI were compared to an age-matched reference group with normal vision in three different studies in order to detect differences in self-reported symptoms between the groups. In addition, a follow-up was conducted in a group of AMD patients.

Results: Patients with VI reported higher levels of VMB symptoms than controls, and this increased over time. Visual deficits and the need for visual enhancement increased the risk of VMB symptoms.

Conclusion: People with VI run a potentially higher risk of VMB symptoms than age-matched controls.

Place, publisher, year, edition, pages
Örebro: Örebro University, 2017. p. 76
Series
Örebro Studies in Medicine, ISSN 1652-4063 ; 162
Keywords
Visual impairment, musculoskeletal symptoms, balance symptoms, visual enhancing aids, age-matched controls
National Category
Surgery
Research subject
Surgery
Identifiers
urn:nbn:se:oru:diva-57087 (URN)978-91-7529-192-5 (ISBN)
Public defence
2017-06-02, Örebro universitet, Campus USÖ, hörsal C3, Södra Grev Rosengatan 32, Örebro, 13:00 (Swedish)
Opponent
Supervisors
Available from: 2017-04-18 Created: 2017-04-18 Last updated: 2017-10-18Bibliographically approved

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Lundqvist, Lars-OlovZetterlund, Christina

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