[Steps Shown] Case control study by Smeeth et al (Lancet 2004) 1294 cases of pervasive developmental disorder (PDD) and 4469 controls were included. 1010 cases
Question: Case control study by Smeeth et al (Lancet 2004)
1294 cases of pervasive developmental disorder (PDD) and 4469 controls were included. 1010 cases (78.1%) had MMR vaccination recorded before diagnosis, compared with 3671 controls (82°1%) before the age at which their matched case was diagnosed.
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![[Step-by-Step] Describe the characteristics in Table 1](/images/solutions/MC-solution-library-75562.jpg "[Step-by-Step] Describe the characteristics in Table 1 in terms of")
[Step-by-Step] Describe the characteristics in Table 1 in terms of
(All Steps) What characteristics showed no differences between the
[Solution] What do these differences
(See Solution) Do the data in Figure 2 above show an association
(See) Do the data in Figure 3 from Smeeth et al show an association
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