That was particularly associated with emergency acutely ill patients, particularly the elderly, with increased lengths of stay that therefore made the number of occupied bed days increase significantly - to unprecedented levels.
The BPF calculates nursing hours per patient day for each inpatient ward or unit and utilises occupied bed days as a demand indicator.
The current study started in 2009 in response to what was perceived by senior nurses as inaccuracies in occupied bed days and occupancy data.
In addition, to clarify how the related issue of occupancy is calculated, initial discussions were held with divisional Business Managers and subsequently with a senior Financial Manager to determine where they sourced their information about occupied bed days and occupancy data for their monthly financial reports.
On the other hand, business managers advised the data source for occupied bed days, and therefore the occupancy rate, is generated from the hospital's Patient Information System.
In terms of occupied bed days, acute hospitals like the Royal Gwent at Newport are the busiest in Wales, but infection rates are now only two thirds the Welsh average and below half the average levels of hospitals in England.