Group examined | Number autism/Autism spectrum disorder events | Net number of doses distributed (1998–2000) | Risk ratio (95% CI) | p-value |
---|---|---|---|---|
Thimerosal-Containing DTaP Vaccine | 38 | 16,335,650 | Â | Â |
 |  |  | 2.02 (1.15–3.56) | < 0.02 |
Thimerosal-Free DTaP Vaccine | 17 | 14,794,210 | Â | Â |