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Samenvatting HC3 frequentie en associatiematen

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HC3 frequentie en associatiematen STEP epidemiologie

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  • December 14, 2018
  • 3
  • 2017/2018
  • Summary
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Statstek en Epidemiologie Evelien Floor



Frequentie- en associatiematen
Ecologische
Individuele studies
studies




Longitudinaal Cross-sectoneel




Experimenteel Observatoneel




Patiënt-
Cohortonderzoek
controleonderzoek




Frequentiematen
Er zijn twee typen frequentematen:
- Iemand heef de ziekte al: prevalentie
- Iemand krijgt de ziekte in de toekomst: incidentie
Prevalentie
Bij cross-sectonele studies worden
determinant en ziekte op hetzelfde moment
gemeten. Prevalente is een aantal personen
met de ziekte op een bepaald moment.
Prevalente (%): het aantal zieken over de
totale populate.
Voorbeelden:
- 50% van de mensen met de verdenking op demente had ernstge atrofe op de MRI van de
hersenen
- In een huisartsenpopulate van 2500 personen, hadden er 50 astma
- 30% van de Nederlanders rookt
- De 12-maands prevalente van depressie is 8%
Issues:
- Setting
- Non-respons
- Selecteve mortaliteit
Incidentie
Incidente: hoe vaak komt de ziekte voor en hoe vaak ontstaat het. Het aantal nieuwe cases in een
populate ‘at risk’, dus mensen die nog niet ziek zijn. Er zijn twee typen incidente:
- Cumulatieve incidentie (CI)
o Is een proporteekans
o Varieert tussen 0 en 1

1

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