condition mean min max ZT0-3 22.00855 19.929499999999997 24.087600000000002 ZT4-7 35.63075 35.63075 35.63075 ZT8-11 21.579549999999998 21.579549999999998 21.579549999999998 ZT12-15 0 0 0 ZT16-19 12.40535 12.40535 12.40535 ZT20-23 23.55595 23.55595 23.55595