condition mean min max ZT0-3 15.5798475 8.263895 22.8958 ZT4-7 12.5795 12.5795 12.5795 ZT8-11 62.391999999999996 62.391999999999996 62.391999999999996 ZT12-15 0 0 0 ZT16-19 45.04895 45.04895 45.04895 ZT20-23 22.6212 22.6212 22.6212