1997b-754 1998j-129 adolescentpsychology appliedpsychology casestudies child childdevelopment classroomenvironment congresses control exercise governmentpolicy healthpromotion infant mentaldisorders mentalhealth mentalhealthservices mentalillness mindandbody physicalfitness prevention preventivementalhealthservices primarycare(medicine) primaryhealthcare primaryprevention psy003000 psychologicalaspects psychology publicwelfare research self-esteeminadolescence self-esteeminchildren sociology students unitedstates well-being wm30p9521997