condition mean min max ZT0-3 0.020672325 0.020672325 0.020672325 ZT4-7 0.014096625 0.014096625 0.014096625 ZT8-11 0.004083108333333333 0.004083108333333333 0.004083108333333333 ZT12-15 0.0 0.0 0.0 ZT16-19 0.015267500000000002 0.015267500000000002 0.015267500000000002 ZT20-23 0.04667525 0.04667525 0.04667525