condition mean min max ZT0-3 6.70263100975 5.327561606000001 8.0777004135 ZT4-7 23.3474383725 22.360025835000002 24.33485091 ZT8-11 17.03121335775 14.5663860055 19.496040710000003 ZT12-15 9.63532727475 9.223993773 10.0466607765 ZT16-19 25.7736989025 19.340194515 32.20720329 ZT20-23 67.2173003025 51.69837986 82.736220745