Estimating influenza-related sick leave in Norway: was work absenteeism higher during the 2009 A(H1N1) pandemic compared to seasonal epidemics?

The impact of influenza on work absenteeism is poorly documented. We used data from the national registry and Norway Post AS (>14,000 employees) to explore sickness absence patterns from 2005/06 through 2009/10 in Norway. Annually, an estimated 2.868% (mean 95% confidence interval (CI): 2.405-4.8...

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