condition mean min max ZT0-3 1.9926609439999998 1.796961785 2.188360103 ZT4-7 1.62185086925 1.1594407565 2.084260982 ZT8-11 2.45538525625 2.1548582554999998 2.7559122570000003 ZT12-15 2.13037217925 2.0823847325 2.178359626 ZT16-19 1.7540268377500001 1.6593855345 1.848668141 ZT20-23 2.190685492 1.9433804675 2.4379905165