Practical 4: Case Studies in Poisson Regression - University of ...

Practical 4: Case Studies in Poisson Regression

Practical 4: Case Studies in Poisson Regression Dankmar B¨ ohning Southampton Statistical Sciences Research Institute University of Southampton, UK

Advanced Statistical Methods in Epidemiology

Practical 4: Case Studies in Poisson Regression Outline

Application of Poisson Regression to the BELCAP Study I

Dental epidemiological study

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A prospective study of schoolchildren from an urban area of Belo Horizonte, Brazil

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The Belo Horizonte caries prevention (BELCAP) study

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The aim of the study was to compare different methods to prevent caries

Practical 4: Case Studies in Poisson Regression Outline

Details: I

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Children selected were all 7 years old and from a similar socio-economic background Interventions: I I I I I I

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Control (3), Oral health education (1), Enrichment of the school diet with rice bran (4), Mouthwash (5), Oral hygiene (6), All four methods together (2)

Interventions were cluster randomised to 6 different schools

Practical 4: Case Studies in Poisson Regression Outline

questions: questions: Using Poisson regression, calculate the I

crude relative risk for each intervention using the control school as reference

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and the relative risk for each intervention adjusting for initial dental status (DMFTB)

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and the relative risk for each intervention adjusting for initial dental status (DMFTB) and gender! Is the adjustment for gender necessary?

use as number of events the DMFT index at the end of study (DMFTE)!