> Among the participants reporting child abuse, 48% had a tattoo or piercing
Based on the quoted text I'd read that (union of abuse and tattoo/piercing) as 48%, not 12%.
Based on the quoted text I'd read that (union of abuse and tattoo/piercing) as 48%, not 12%.
"Among the participants reporting child abuse (25% of all respondents), 48% had a tattoo or piercing" ― out of 100 people, 25 were abused and 48% of them (i.e. 12 people) have tattoos → 12 of 100 respondents have tattoos and were abused, while 28 just have tattoos.