the lead author of the study, brandon baker, a postdoc fellow from seattle children's research institute. brandon, thanks for your time. >> hi there. thank you. >> hi. so you looked at gestational exposure to acetaminophen, the key ingredient in tylenol and generic versions. what did you discover? >> right. so this study concerned acetaminophen, which is the active ingredient in tylenol. as you said, it's also the active ingredient in other medications to treat cold pain and fever. and we found that use of acetaminophen during pregnancy was linked with higher chances of the child developing adhd. >> how much higher? >> in this particular study, if we found acetaminophen in the blood of the mom during pregnancy, there was a three times higher risk for the child to develop adhd. >> so how many people were in this study and over how many years? because you want to know, you know, is this a lot of people? >> yeah, that's a great question. so in this kind of study, we enroll individuals during pregnancy. we collect a lot of data on them. and then we follow up the children. in this case, we ha