Relative incidence of onset of regression after MMR immunisation in children with childhood and atypical autism
| 1998 study (n=86) | 2000 study—born from 1995 (n=26) | |||
|---|---|---|---|---|
| Risk period post-MMR (mth) | RI (95% CI) | Cases in risk period | RI (95% CI) | Cases in risk period |
| <2 | 1.01 (0.38 to 2.63) | 6 | 1.82 (0.50 to 6.64) | 5 |
| <4 | 0.99 (0.48 to 2.09) | 14 | 2.07 (0.65 to 6.61) | 10 |
| <6 | 0.97 (0.49 to 2.04) | 24 | 2.10 (0.64 to 6.91) | 16 |
| <12 | 0.94 (0.44 to 2.02) | 46 | 1.76 (0.34 to 8.97) | 19 |