Medibank Private found
53% of workers took one or more days off work over 4 weeks where as 77% came to work while suffering with a health issue over the same period.
88% of staff who attended work while ill admit to being less productive.
On average, staff who attended work while ill or suffering a health condition report their productivity diminished by 45%.

(Econtech independent economic consultancy, 2007, Sick at work: The Cost of Presenteeism)

Workplace tasks affected during presenteeism
78% found it difficult to think clearly.
66% found it difficult to do their work without making mistakes.
64% felt they did not do all that they were capable of doing.
67% found it difficult to work the number of hours required.
62% found it difficult to continue working without taking unscheduled breaks.
(Econtech independent economic consultancy, 2007, Sick at work: The Cost of Presenteeism)

Successful health programs in the workplace
Johnson and Johnson Health and Wellness Program (Ozminkowski, R.J, January 2002, Long-term Impact of  Johnson and Johnson’s Health and Wellness Program on Healthcare Utilization and Expenditures)Johnson and Johnson conducted a long-term health and wellness program on healthcare utilization and expenditures.The study concluded that “A well-conceived health and wellness program that focuses on prevention, self-care, risk factor reduction, and disease management can produce substantial benefits for employers and their employees.”