The statistics in this release are a new presentation of the data released as part of the Key Statistics and Quick Statistics for output areas in England and Wales that were published 30 January 2013. They provide new best fit aggregations of these statistics for health administration areas and postcode sectors in England and Wales, and also for National Assembly for Wales constituencies and Assembly for Wales electoral regions. The estimates are best-fitted from output areas in line with the Geography Policy for National Statistics.

There are 35 Key Statistics tables and 69 Quick Statistics tables. Each table can be accessed using the descriptive links contained within the index file..

The statistics are provided for: Health administration areas in England and Wales, as at December 2011; 10 strategic health authorities (SHA) and 151 primary care organisations (PCO) in England, the latter made up of 146 primary care trusts (PCT) and five care trusts (CT), and seven local health boards (LHB) in Wales.

Enumeration postcode sectors, districts and areas in England and Wales, as at December 2011.

Results are also provided for the 40 National Assembly for Wales constituencies (NAWC) used to elect members to the National Assembly for Wales (NAW), and the five National Assembly for Wales electoral regions (NAWER) used for the proportional component of the elections to the Assembly. The 40 assembly constituencies are identical to the 40 Westminster parliamentary constituencies in Wales that were included in the Key and Quick Statistics for parliamentary constituencies in England and Wales.