condition mean min max ZT0-3 963.5776534 511.0514619 1416.1038449 ZT4-7 2693.601619 2300.6100095 3086.5932285 ZT8-11 1637.102134725 1165.2535734500002 2108.950696 ZT12-15 103.97725928249999 29.307005235 178.64751332999998 ZT16-19 43.495889392500004 34.855703175 52.13607561 ZT20-23 44.4347124925 31.340783554999998 57.52864142999999