condition mean min max ZT0-3 1262.346773 1262.346773 1262.346773 ZT4-7 716.5233195000001 716.5233195000001 716.5233195000001 ZT8-11 451.44661099999996 451.44661099999996 451.44661099999996 ZT12-15 430.5888165 430.5888165 430.5888165 ZT16-19 1094.3319885 1094.3319885 1094.3319885 ZT20-23 2550.2618924999997 2550.2618924999997 2550.2618924999997