condition mean min max ZT0-3 19.629425 16.581850000000003 22.677 ZT4-7 34.278549999999996 34.278549999999996 34.278549999999996 ZT8-11 158.135 158.135 158.135 ZT12-15 0 0 0 ZT16-19 74.27925 74.27925 74.27925 ZT20-23 43.04985 43.04985 43.04985