Table 1.
Characteristics and Representativeness of Practice Sample (n = 42) Compared With All General Practices in England
| Characteristic | Na | Mean | SD | 10th Percentile | Median | 90th Percentile |
|---|---|---|---|---|---|---|
| Overall QOFb achievement 2007 | ||||||
| Englandc | 8,372 | 89.8 | 5.0 | 84.7 | 90.8 | 94.1 |
| Study sample | 42 | 89.6 | 3.5 | 86.1 | 90.0 | 93.1 |
| Practice list size 2007 | ||||||
| Englandc | 8,582 | 6,422 | 3,965 | 2,238 | 5,590 | 11,784 |
| Study sample | 42 | 6,620 | 3,846 | 2,370 | 6,118 | 11,342 |
| Overall QOF achievement 2005 | ||||||
| Englandc | 8,500 | 79.8 | 8.7 | 68.7 | 81.7 | 88.4 |
| Study sample | 42 | 80.6 | 7.0 | 71.1 | 82.2 | 88.6 |
| Practice list size 2005 | ||||||
| Englandc | 8,458 | 6,237 | 3,866 | 2,180 | 5,409 | 11,553 |
| Study sample | 41 | 6,617 | 3,837 | 2,456 | 5,921 | 11,481 |
| Practice list size 2003 | ||||||
| Englandc | 7,842 | 5,983 | 3,776 | 2,076 | 5,170 | 11,185 |
| Study sample | 39 | 6,367 | 3,767 | 2,163 | 5,862 | 11,270 |
| Deprivation: SOA IMDd (2005) | ||||||
| Englandc | 8,582 | 26.0 | 17.1 | 7.4 | 21.6 | 51.3 |
| Study sample | 42 | 27.3 | 20.6 | 7.3 | 20.1 | 62.7 |
GMS = General Medical Services; IMD = Index of Multiple Deprivation; NHS = National Health Service; QOF = Quality and Outcomes Framework: SOA = Super Output Area.
a Practice list sizes from GMS data (Reused with the permission of The Health and Social Care Information Centre).
b QOF achievement obtained from the NHS Information Centre (http://www.qof.ic.nhs.uk/).
c Data correspond to all practices in England.
d IMD data available from the Communities and Neighbourhoods Web site (http://webarchive.nationalarchives.gov.uk/+/communities.gov.uk/communities/neighbourhoodrenewal/deprivation/deprivation07/.