condition mean min max ZT0-3 0.2098556865 0.0 0.419711373 ZT4-7 2.38036075725 1.2457861895 3.5149353249999997 ZT8-11 4.185853149 4.184518023 4.1871882750000005 ZT12-15 1.9157909634999997 1.568695631 2.2628862959999996 ZT16-19 2.05197883525 1.705185465 2.3987722055000003 ZT20-23 2.5601616175 2.5404858215 2.5798374135