At US$ 50,000 per QALY , adolescents with 8 or more friends achieved NMB of US$ 214,300 ( 95 % CI 212,800-215 ,800 ) over a 5-year span , in comparison to adolescents with 0-1 friends , who attained US$ 209,900 ( 95 % CI 207,900-211 ,700 ) NMB .