condition mean min max ZT0-3 0.16656391750000002 0.06930790099999999 0.26381993400000003 ZT4-7 0.44602840650000003 0.34735282700000003 0.544703986 ZT8-11 0.50956672875 0.3969280595 0.622205398 ZT12-15 0.462383568 0.3701206905 0.5546464455 ZT16-19 1.0952904719999998 0.7468698905 1.4437110535 ZT20-23 2.60914585225 1.7188160965 3.499475608