We have considered the feedback and adjusted our method accordingly. The main changes in this second edition are as follows.
• Schools have had to pass more stringent criteria in order to be included in the data sample. No missing or inconsistent data has been tolerated.
• The size of the data sample has increased. In addition to including schools that qualified as a result of there being an additional year of data available, we only required each school to have data for three years before and two years after construction completion.
• The datasets of rebuilt PFI and conventionally financed schools were confirmed, through statistical testing, as being representative of all schools undergoing refurbishment or rebuilding.