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Exploring Prevalence Data in Health: A Comparison of Leading Sources and Statistics

This workshop focuses on the exploration and comparison of health prevalence data from various sources, including PRIMIS, QMAS, and QResearch. We will discuss the extraction of data from 0.5 million patients with epilepsy and 16 million in diabetes and blood pressure categories. Key statistics will be analyzed, highlighting the prevalence of hypertension, ischaemic heart disease, stroke, heart failure, diabetes, asthma, and epilepsy. We will also cover issues such as data quality, definitions, selection bias, and interrogation routines, emphasizing the importance of understanding what health statistics reveal and conceal.

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Exploring Prevalence Data in Health: A Comparison of Leading Sources and Statistics

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Presentation Transcript

  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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