Question: 2. Case control study by Smeeth et al (Lancet 2004) 1294 cases of pervasive developmental disorder (PDD) and 4469 controls were included. 1010 cases (781%)

2. Case control study by Smeeth et al (Lancet 2004) 1294 cases of pervasive developmental disorder (PDD) and 4469 controls were included. 1010 cases (781%) had MMR vaccination recorded before diagnosis, compared with 3671 controls (821%) before the age at which their matched case was diagnosed.

Cases With PPD

Cases Without PPD

Total

MMR Vaccinated

1010

3671

4681

Not MMR Vaccinated

284

798

1082

Total

1294

4469

5763

Would you use OR or RR to calculate the answer and why?

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