As these findings were unexpected, we checked whether they might be an artifact, arising from differential non-response rate of children with ODD at Wave 1 at later study waves. We found no evidence for a pattern of this kind. Later participation rates were high across all the pathway groupings, and did not differ between the ODD→CD (89.7%, 95% CI: 85.4, 94.1) and ODD never CD paths (88.8%, 95% CI: 84.9, 92.7).
