Table 1

Absenteeism and percent of hours lost due to own illness or disability attributed to influenza in employed persons 15 years of age and older

Season/Wave

Length of Period

% of Hours Worked that were Lost Due to Own Illness or Disability

% of Potential Hours Worked that were Lost Due to Own Illness and Attributed to Influenza1

% of Hours Lost that were Attributable to Influenza

Estimated % of Employees Absent due to Influenza per Period (Wave/Season)1


Seasonal

Annual (12 months)

2.9%

0.08%

3%

11.5%

H1N1/09

Pro-rated to annual

(May09-April10)

3.1%

0.19%

6%

13.4%

H1N1/09

Spring

4 months (May-Aug09)

2.8%

0.12%

4%

2.9%

Fall

4 months (Sept-Dec09)

3.2%

0.47%

15%

10.5%

Oct-09

1 month

3.2%

0.59%2

18%

3.3%

Nov-09

1 month

3.9%

1.25%2

32%

6.7%2

Dec-09

1 month

3.0%

0.05%

2%

0.3%


1 The attribution to influenza was estimated on an annual basis, as described in the methods sections. Monthly estimates were calculated as the model-predicted estimate less estimated baseline and agree with the influenza-attributed time series in Figure 4.

2 The number of hours lost or number of absences reported for the indicated reference weeks were significantly above the estimated baseline (95% confidence level). The excess for these months is not shown in this table, though can be seen in Figures 4 and 5.

Schanzer et al. BMC Infectious Diseases 2011 11:90   doi:10.1186/1471-2334-11-90

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