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Ischaemic heart disease among workers in occupations associated with heavy lifting

100%
Hannerz H., Holtermann A.
International Journal of Occupational Medicine and Environmental Health
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2015
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vol. 29
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issue 1
129-136
EN
Objectives To investigate a hypothesized positive association between employment in occupations where heavy lifting is likely to occur, and the risk of ischaemic heart disease (IHD). Material and Methods Male blue-collar workers from Denmark (N = 516 180) were monitored with respect to hospital treatment or death due to IHD, through national registers over the years 2001–2010. Poisson regression was used to estimate relative rates of IHD between “workers in occupations which, according to an expert opinion, are likely to involve heavy lifting” and “other blue-collar workers.” Prevalent cases were excluded from the analysis. Results The rate ratio was estimated at 0.97 (95% confidence interval (CI): 0.94–1.00) for deaths or hospitalizations due to IHD and 1.07 (95% CI: 0.94–1.21) for deaths due to IHD. Conclusions The results do not support the hypothesis that occupational heavy lifting is an important risk factor for IHD.
2
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Correlation between relative rates of hospital treatment or death due to ischaemic heart disease (IHD) and of IHD-related medication among socio-occupational and economic activities groups in Denmark, 1996–2005

81%
Hannerz H., Dalhoff K., Burr H., Latza U.
International Journal of Occupational Medicine and Environmental Health
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2014
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vol. 27
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issue 4
536-546
EN
Objective: The aim of the present work was to establish whether or not prescribed medication is a usable risk indicator for work‑related ischaemic heart disease (IHD), in Denmark. Material and Methods: Weighted Spearman rank correlation coefficients (rho) were used to evaluate the agreement between Standardised Hazard Ratios (SHR) for hospital treatment or death due to IHD and SHR for purchase of prescriptions for medicine that may prevent IHD from (re)occurring, among socio-occupational and economic activities groups in Denmark. The SHR were based on a 10-year prospective follow-up of 2 million people in Danish national registers 1996–2005. Results: We found approximately 7 times more cases of medicine usage (N = 411 651) than we did for hospital treatment or death (N = 55 684). The correlations between the 2 types of SHR were strong (rho = 0.94 for the socio-occupational groups; rho = 0.74 for the economic activities groups). We observed, however, one markedly contradictive result; the industrial group entitled ‘general practitioner, dentists etc.’ was associated both with significantly high rates of medicine usage (SHR = 1.15, 95% CI: 1.12–1.19) and significantly low rates of hospital treatment or death due to IHD (SHR = 0.80, 95% CI: 0.71–0.91). Conclusion: Apart from a few caveats, the strong correlations obtained in the present study signify that purchase of a prescription for IHD-related medication is a usable risk indicator for IHD in the working population of Denmark. The usage of medicine data in addition to or instead of the use of death or hospital data in epidemiological studies on work-related IHD risk will bring about a tremendous increase in statistical power.
3
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Time trend analysis of return to work after stroke in Denmark 1996–2006

61%
Hannerz H., Mortensen O. S., Poulsen O. M., Humle F., Pedersen B. H., Andersen L. L.
International Journal of Occupational Medicine and Environmental Health
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2012
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vol. 25
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issue 2
200-204
EN
Background: In the period 1997–2005, the Danish government initiated a series of legislative changes aimed at facilitating RTW (return to work) in the Danish population. In the present study, we investigated the odds of being gainfully occupied ca. two years after stroke as a function of onset calendar year, 1996–2006. Methods: All previously employed 20–57 year-old stroke patients in Denmark 1996–2006 (N = 19 985) were followed prospectively through national registers. The analysis was controlled for the type of stroke and a series of demographic, structural and occupational variables. Results: The odds for RTW increased significantly during the study period (P < 0.0001). The odds at the end of the period were more than twice as high as they were at the beginning, even after post hoc control for improved survival and decreased unemployment rates. The most conspicuous increase coincided with a change in the sickness benefit act that took place in 2005. Conclusion: The study provides quite strong circumstantial evidence that the legislative changes had an effect on the odds of return to work after stroke. More direct evidence is desirable, but such can only be obtained through a randomized controlled study.
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