condition mean min max ZT0-3 264.60085738 162.73948756000001 366.4622272 ZT4-7 43.547899852499995 38.052558815 49.04324089 ZT8-11 31.0511740625 26.94429365 35.158054475 ZT12-15 20.994920110000002 16.22248771 25.767352510000002 ZT16-19 21.153191655 17.415122404999998 24.891260905000003 ZT20-23 49.309117632500005 39.963872515 58.654362750000004