Chest
Original ResearchSleep MedicineIncreased Risk of Lost Workdays Prior to the Diagnosis of Sleep Apnea
Section snippets
Study Population and Design
The data were derived from the ongoing prospective Finnish Public Sector Study.24 The participants' personal identification numbers (a unique number assigned to each Finnish citizen used for all contacts with the social welfare and health-care systems) were used to link the participants to hospitalization, sickness absence, and disability pension records from national registers covering the years 1994 to 2005. Based on employers' records, 151,618 public sector employees were employed for at
Results
Table 1 shows the baseline characteristics of the 957 sleep apnea case patients and 4,785 control subjects. Sociodemographic and occupational characteristics did not differ between the groups, confirming the success of matching. As expected, the case patients had significantly more comorbid medical conditions than the control subjects (Table 1).
In men, the overall rate of lost workdays was 1.6 times greater (RR, 1.61; 95% CI, 1.24 to 2.09 times greater) and in women 1.8 times greater (RR, 1.80;
Discussion
In this register-linkage study of Finnish public sector employees, an increased risk of lost workdays due to work disability was found prior to diagnosis in employees in whom sleep apnea developed. The overall rate of lost workdays during the 5-year period preceding the year of diagnosis was 1.6 times greater in male case patients and 1.8 times greater in female case patients compared to control subjects, resulting in 30.0 and 80.5 extra lost days, respectively, in men and women. The
Conclusion
Data from this large register-based study of public sector employees suggest that the development of sleep apnea substantially increases the number of lost workdays. These results add to the evidence demonstrating the importance of the early identification and treatment of employees with sleep apnea. Further research is needed to examine whether our findings are generalizable to other populations.
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This work was performed at the Finnish Institute of Occupational Health, Finland.
This study was supported by the Social Insurance Institution of Finland, and the Academy of Finland (projects No. 117 604, No. 124 271, No. 124 322, No. 126 602, No. 129 262, and No. 129 264).
Dr. Saaresranta has received a total of €2,100 due to presentations in national symposia for Boehringer Ingelheim, Finland; Resmed Finland; and MSD Finland. Drs. Sjösten, Vahtera, Salo, Oksanen, Virtanen and Kivimäki, and Ms. Pentti have reported to the ACCP that no significant conflicts of interest exist with any companies/organizations whose products or services may be discussed in this article.
Reproduction of this article is prohibited without written permission from the American College of Chest Physicians (www.chestjournal.org/site/misc/reprints.xhtml).