condition mean min max ZT0-3 1.99647659075 0.687095592 3.3058575895 ZT4-7 13.734936913499999 10.184799617 17.285074209999998 ZT8-11 40.4139933125 29.534534845000003 51.29345178 ZT12-15 58.76155422 52.83941147 64.68369697 ZT16-19 45.58325819 39.446170135 51.720346245 ZT20-23 28.0809085425 27.257773305 28.904043780000002