Question: is this a 2) strong advice, 1) weak advice 0) no advice?

After stratifying the study population in subjects vaccinated in infancy or adolescence, a significant difference in the proportion of seroprotected subjects emerged: a higher prevalence of seroprotected have been registered among those vaccinated in adolescence (81.9% vs 66.9%, p < 0.001). 
user
This is no advice
assistant