Additionally, as this was a multi-site study, we assessed if there were site differences for demographic variables. We found that there were significant site differences for age and race (ps < .034). Further, to ensure that site did not affect our results, we re-ran the analyses using a 2 (AE: Exposed, Non-Exposed) × 2 (ADHD status: Diagnosed, Not Diagnosed) × 5 (Site: Albuquerque, Atlanta, Los Angeles, Northern Plains States, San Diego). The three-way interaction was not significant (p = .644) and the main effects and interaction effects remained the same. Therefore, we are able to confirm that there was no difference for the main effects of exposure or ADHD across sites.
