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Outline of presentation (workshop!)

Outline of presentation (workshop!). Data sources Exploration and comparison of prevalence data from different sources Discussion. Data sources. PRIMIS data extractions Cumulative 01.01.2003 – 31.01.2005 0.5 million patients (Epilepsy); 16 million (DM, BP) Key Health Statistics 1998

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Outline of presentation (workshop!)

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  1. Outline of presentation (workshop!) • Data sources • Exploration and comparison of prevalence data from different sources • Discussion

  2. Data sources • PRIMIS data extractions • Cumulative 01.01.2003 – 31.01.2005 • 0.5 million patients (Epilepsy); 16 million (DM, BP) • Key Health Statistics 1998 • Office for National Statistics • General Practice Research Database • 1.2 million patients • QMAS • National prevalence day • Entire population (almost) • www.qualitymedicalsolutions.co.uk • QResearch (2003) • University of Nottingham research database • 426 practices • 2.9 million patients

  3. Medical Statistics are like a bikini • What they reveal is interesting, but what they conceal is vital

  4. Prevalence of Hypertension 95% CI PRIMIS (n=16 million) 103.6 103.5 – 103.8 Key Statistics 79.5 79.0 – 80.0 QMAS 108.9 QResearch 117.8 117.4 – 118.2

  5. Hypertension

  6. Prevalence of Ischaemic heart disease 95% CI PRIMIS (n=7.6 million) 37.9 37.7 – 38.0 Key Statistics 37.2 36.8 – 37.5 QMAS 34.6 QResearch 40.6 40.3 – 40.8

  7. 1999 2000 2001 2002 2003 2004

  8. Prevalence of Stroke disease 95% CI PRIMIS (n=5.3 million) 15.3 15.2 – 15.4 Key Statistics 2.3 2.2 – 2.3 QMAS 16.5 QResearch 17.9 17.8 – 18.1

  9. Prevalence of Heart failure 95% CI PRIMIS (n=5.3 million) 9.2 9.1 – 9.3 QMAS 4.2

  10. Prevalence of Diabetes mellitus 95% CI PRIMIS (n=8 million) 30.0 29.9 – 30.2 Key Statistics 16.7 16.5 – 17.0 QMAS 33.5 QResearch 32.0 31.8 – 32.2 Keele GPRN Core 36.4

  11. Diabetes

  12. Prevalence of Asthma (treated) 95% CI PRIMIS (n=0.9 million) 63.5 62.9 – 64.0 Key Statistics 74.3 73.8 – 74.8 QMAS 55.5 QResearch (all asthma) 72.3 71.6 – 72.9

  13. Prevalence of Epilepsy 95% CI PRIMIS (n=0.5 million) 10.7 10.4 – 11.0 QMAS 5.7 QResearch 10.2 10.1 – 10.4

  14. Issues • Data quality • Definitions and standards • Selection bias • ‘Creative accounting’ • Data extraction / interrogation routines

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