One study, led by Arria — and funded by Ortho - McNeil - Janssen, the makers of the stimulant Concerta — found that 17 % of stimulant misusers had ADHD symptoms, compared with about 9 % of the group of nonusers. (health.com)
«Study with «never - smokers» sheds light on the earliest stages of nicotine dependence: Study examines vulnerability to nicotine addiction among nonusers.» (sciencedaily.com)
After three to 67 months of follow - up, 38 dental implants failed and 784 succeeded in nonusers group while 10 failed and 84 succeeded in SSRIs - users group. (sciencedaily.com)