condition mean min max ZT0-3 31.690949999999997 31.18085 32.201049999999995 ZT4-7 18.796750000000003 18.796750000000003 18.796750000000003 ZT8-11 10.97195 10.97195 10.97195 ZT12-15 0 0 0 ZT16-19 14.191500000000001 14.191500000000001 14.191500000000001 ZT20-23 19.4476 19.4476 19.4476