Table 2

Relative incidence of timing of first parental concern in relation to MMR immunisation in children with childhood and atypical autism

1998 study (n=283)2000 study—born from 1995 (n=95)
Risk period post-MMR (mth)RI (95% CI)Cases in risk periodRI (95% CI)Cases in risk period
<21.07 (0.58 to 1.98)141.17 (0.48 to 2.87)7
<41.18 (0.76 to 1.83)341.25 (0.61 to 2.59)15
<61.55 (1.05 to 2.29)650.82 (0.41 to 1.64)22
<120.91 (0.61 to 1.34)1061.53 (0.75 to 3.11)52