condition mean min max ZT0-3 0.8507075 0.8507075 0.8507075 ZT4-7 0.47421599999999997 0.47421599999999997 0.47421599999999997 ZT8-11 0.32856949999999996 0.32856949999999996 0.32856949999999996 ZT12-15 0.33621650000000003 0.33621650000000003 0.33621650000000003 ZT16-19 0.751969 0.751969 0.751969 ZT20-23 0.6469725 0.6469725 0.6469725