General sample characteristics by flu season (2011–12, 2012–13, 2013–14, 2014–15) in NHS trusts in England (n=223)
| Flu season | ||||||||
|---|---|---|---|---|---|---|---|---|
| 2011–12 | 2012–13 | 2013–14 | 2014–15 | |||||
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| Sickness absence rate | 4.467 | 0.862 | 4.592 | 0.910 | 4.376 | 0.879 | 4.635 | 0.951 |
| Flu vaccine uptake, % | 43.6 | 15.3 | 44.0 | 16.8 | 54.3 | 15.8 | 54.3 | 15.6 |
| Doctors | 45.1 | 22.0 | 43.4 | 22.3 | 53.8 | 21.0 | 53.2 | 23.2 |
| Nurses | 38.5 | 17.1 | 39.0 | 18.0 | 48.0 | 18.1 | 47.7 | 17.4 |
| Other clinical staff | 49.4 | 20.6 | 49.8 | 20.6 | 59.1 | 19.6 | 58.6 | 18.9 |
| Non-clinical support staff | 49.4 | 23.1 | 50.6 | 24.8 | 60.1 | 23.0 | 60.9 | 22.7 |