The 4-week total prevalence for any mental disorder was 31.8 % ( 95 % CI , 29.8 % to 33.8 % ) ; this included any anxiety disorder ( 11.5 % ; 95 % CI , 10.2 % to 12.9 % ) , any adjustment disorder ( 11.1 % ; 95 % CI , 9.7 % to 12.4 % ) , any mood disorder ( 6.5 % ; 95 % CI , 5.5 % to 7.5 % ) , any somatoform/conversion disorder ( 5.3 % ; 95 % CI , 4.3 % to 6.2 % ) , nicotine dependence ( 4.5 % ; 95 % CI , 3.6 % to 5.4 % ) , alcohol abuse/dependence ( 0.3 % ; 95 % CI , 0.1 % to 0.6 % ) , any mental disorder resulting from general medical condition ( 2.3 % ; 95 % CI , 1.7 % to 2.9 % ) , and any eating disorder ( 0 % ) .