condition mean min max ZT0-3 25.229 23.44095 27.136400000000002 ZT4-7 18.98005 18.98005 18.98005 ZT8-11 24.07545 24.07545 24.07545 ZT12-15 42.004374999999996 39.176249999999996 44.832499999999996 ZT16-19 40.13015 40.13015 40.13015 ZT20-23 34.714150000000004 34.714150000000004 34.714150000000004