condition mean min max ZT0-3 360.358676 360.358676 360.358676 ZT4-7 352.39794600000005 352.39794600000005 352.39794600000005 ZT8-11 357.47747649999997 357.47747649999997 357.47747649999997 ZT12-15 330.156153 330.156153 330.156153 ZT16-19 379.67859999999996 379.67859999999996 379.67859999999996 ZT20-23 281.2970535 281.2970535 281.2970535