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Sleep disturbances as predictors of hospitalization for back disorder: a 28-year follow-up of industrial employees

Kaila-Kangas, L.; Kivimäki, M.; Härmä, M.; Riihimäki, H.; Luukkonen, R.; Kirjonen, J.; Leino-Arjas, P.; (2006) Sleep disturbances as predictors of hospitalization for back disorder: a 28-year follow-up of industrial employees. Spine , 31 (1) pp. 51-56.

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Abstract

Study Design: A prospective cohort study. Objective: To study the relationship of sleep disturbances with severe back disorders leading to hospitalization. Summary of Background Data: Sleep disturbances are associated with persistent pain syndromes, but little is known about their relationship with back disorders. Methods: The first hospital admission for back disorders from 1973 to 2000 was studied in a cohort of metal industry workers (n = 902). The occurrence of sleep disturbances at baseline was categorized as: none; 1 type (either difficulties in falling asleep/waking up at night or nightmares); or both types. Cox proportional hazards regression was used to estimate the time between the assessment of risk factors and first hospital admission for back disorders. Results: Those individuals who had 1 type of sleep disturbance had a 2.1-fold (95% confidence interval 1.1-3.8) risk of back-related hospitalization, and those with both types of disturbance a 2.4-fold (1.2-4.6) risk, compared with those with no sleep disturbances. The hazard ratios were 2.1; 1.0-4.6 and 2.9; 1.2-7.1, respectively, when patients with chronic back disease or recurrent back symptoms at baseline were excluded from the analyses. Conclusion: These findings suggest that sleep disturbances are predictive of hospitalization for back disorders. The mechanism underlying this association warrants further study.

Type: Article
Title: Sleep disturbances as predictors of hospitalization for back disorder: a 28-year follow-up of industrial employees
Identifier: PMID: 16395176
Publisher version: http://www.spinejournal.com/pt/re/spine/abstract.0...
Language: English
UCL classification: UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > Institute of Epidemiology and Health > Epidemiology and Public Health
URI: http://discovery.ucl.ac.uk/id/eprint/5489
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