As staff surveys go, they don't get much bigger than this.
The recently released NHS national staff survey takes in the views of more than 128,000 employees across 326 healthcare trusts in England. Undertaken by the Healthcare Commission watchdog, it is believed to be the largest annual study of its kind in the world.
As to be expected from a survey on this scale, it draws a complicated picture. The real value comes from looking at developments over time, and the commission has been able to draw a number of conclusions on trends among NHS staff.
The percentage of NHS employees who admitted to having suffered work-related stress is down from 39% in 2003 to 33% last year. There has also been a downturn in the proportion of the workforce suffering injury or illness because of work, from 22% in 2003 to 17% in 2006.
Safety also showed a long-term improvement, with the percentage of staff saying they saw errors, incidents or 'near misses' with potential to harm patients falling from 49% in 2003 to 38% in 2006.
However, on the flip side, positive levels of job satisfaction, although still significant, have edged down over the past few years, while the amount of violence and abuse being experienced by staff in the NHS remains depressingly high. The figures showed a slight increase from last year, with 31% experiencing violence or abuse in 2006, compared with 30% in 2005.
Perhaps unsurprisingly, the findings have been interpreted in different ways. At NHS Employers, the organisation responsible for workforce issues in the service, director Steve Barnett said the results vindicated a number of campaigns launched in the recent past, which have been aimed at educating employees to identify signs of stress and bullying in the workplace.
"On balance, the NHS is a better place to work, with more support for employees," he said. "We are improving working lives and making it a place that people want to work and stay."
However, at public services union Unison, which represents more than 400,000 health professionals across the UK, the view is rather different, especially in the light