condition mean min max ZT0-3 58.444529 58.444529 58.444529 ZT4-7 136.39587 136.39587 136.39587 ZT8-11 405.32570450000003 405.32570450000003 405.32570450000003 ZT12-15 302.5873845 302.5873845 302.5873845 ZT16-19 243.53345000000002 243.53345000000002 243.53345000000002 ZT20-23 60.75544 60.75544 60.75544