tokens: Subjects with a short postexposure time and a dioxin burden > 0 . 6 pg / m3 had a significantly higher risk of hypoergy than unexposed subjects ( hypoergy I : OR = 9 . 51 , 95 % CI = 1 . 96 - 42 . 02 ; hypoergy II : OR = 2 . 92 , 95 % CI = 1 . 14 - 7 . 5 ) .