condition mean min max ZT0-3 13.279250000000001 13.058150000000001 13.500350000000001 ZT4-7 10.28229 10.28229 10.28229 ZT8-11 9.66827 9.66827 9.66827 ZT12-15 0 0 0 ZT16-19 15.315000000000001 15.315000000000001 15.315000000000001 ZT20-23 13.841899999999999 13.841899999999999 13.841899999999999