Abstract
OBJECTIVES: To estimate the number and cost of asthma-related productivity loss days due to absenteeism and presenteeism (at work but not fully functioning) in Alberta in 2005. METHODS: Using data from the 2005 Canadian Community Health Survey, this study focused on people of working age (18-64 years), who reported having an asthma diagnosis. Total asthma-related disability days, including in-bed days and activity-restricted days, were estimated by multiplying the difference in the means of total disability days between asthmatics and nonasthmatics adjusted for sociodemographic characteristics and other health conditions by a multiple linear regression, with the number of asthmatics in the population. Number of productivity loss days was a sum between the number of in-bed days (absenteeism) and the number of activity-restricted days multiplied by a reduction in functional level (presenteeism), adjusted for five working days per week. Other data from Alberta or Canadian published literature, such as a reduction in functional level of 20%-30%, a labor participation rate of 73%, and an average wage of $158 per day in 2005, were also used for analyses. RESULTS: The prevalence of asthma was estimated at 8.5% among approximately 2.1 million people of working age in Alberta in 2005. The difference in the means of total disability days between asthmatics and nonasthmatics was 0.487 (95% CI: 0.286-0.688) in a period of two weeks or 12.7 (7.5-17.9) in one year. With the reduction in functional level of 20%-30%, the number of asthma-related productivity loss days was estimated from 442 (259-624) to 533 (313-753) thousand, respectively. The corresponding cost was from $70 ($41-$99) to $84 ($49-$119) million. Of these, the presenteeism accounted for 42% to 52%. CONCLUSIONS: The results suggest that an improvement in the controlling of asthma could have a significant economic impact in Alberta and that presenteeism plays an important role in asthma-related productivity losses and therefore employers should not only pay attention to absenteeism, but also to presenteeism to minimize productivity loss.