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Table 2 The absolute and relative change in mean daily all-cause sickness absence rates by periodsa

From: Increases in absenteeism among health care workers in Hong Kong during influenza epidemics, 2004–2009

Absolute change in mean daily all-cause sickness absence rate (%)
Staff type Epidemic periodb Containment periodc Mitigation periodd
Medical 0.13 (0.10, 0.16) 0.03 (−0.05, 0.10) 0.36 (0.32, 0.39)
Nursing 0.07 (0.03, 0.10) 0.30 (0.20, 0.39) 0.48 (0.43, 0.52)
Allied Health 0.13 (0.09, 0.18) 0.44 (0.33, 0.54) 0.67 (0.62, 0.72)
Management −0.08 (−0.23, 0.07) −0.88 (−1.24, −0.53) −0.21 (−0.38, −0.04)
Supporting 0.11 (0.06, 0.15) 0.57 (0.47, 0.67) 0.87 (0.82, 0.92)
Overall 0.09 (0.06, 0.13) 0.39 (0.32, 0.46) 0.65 (0.61, 0.68)
Relative change in mean daily all-cause sickness absence rate (%)
Staff type Epidemic period Containment period Mitigation period
Medical 51.3 (38.9, 63.7) 10.2 (−18.7, 39.1) 142.1 (128.0, 156.1)
Nursing 4.5 (1.8, 7.1) 20.2 (14.0, 26.4) 32.7 (29.7, 35.7)
Allied Health 19.3 (13.2, 25.4) 61.4 (47.0, 75.7) 94.5 (87.6, 101.5)
Management −9.0 (−25.3, 7.4) −96.3 (−134.6, −58.0) −22.6 (−41.2, −4.0)
Supporting 8.6 (4.3, 12.9) 51.6 (41.5, 61.7) 77.6 (72.6, 82.5)
Overall 8.4 (5.6, 11.2) 35.0 (28.6, 41.4) 57.7 (54.6, 60.9)
  1. aRegression model adjusted for day-of-the-week, holiday effect and seasonality. Positive figures represent an excess, negatives figures represent a decrease in sickness absence rate in the different periods, comparing to the baseline non-epidemic period
  2. bEpidemic periods: any two or more consecutive weeks with ≥4 % of the annual number of positive influenza isolation from the virological reference laboratory in the Hong Kong West Cluster [14]
  3. cContainment period: from May 1, 2009 to June 10, 2009, starting from the date that the WHO issued a global alert till the occurrence of the first untraceable local case of A(H1N1)pdm09 in Hong Kong
  4. dMitigation period: from June 11, 2009 to December 31, 2009, starting from the occurrence of the first untraceable local case of A(H1N1)pdm09 in Hong Kong through to the end of the study period [15]