Changes between recorded and expected prevalence of COPD, persons aged 16+, 2009–2011 (QOF)
| Time period | Recorded prevalence | Expected prevalence | Undiagnosed prevalence | ||
| Number | % | Number | % | ||
| 2010/2011 | 2966 | 1.6% | 3.7% | 3750 | 2.1% |
| 2009/2010 | 2651 | 1.4% | 4240 | 2.3% | |
| 2008/2009 | 2579 | 1.4% | 4160 | 2.3% | |