condition mean min max ZT0-3 0.7106128333333334 0.389619 1.0280615 ZT4-7 0.1260865 0.1260865 0.1260865 ZT8-11 1.1732974999999999 1.1732974999999999 1.1732974999999999 ZT12-15 2.0711325 1.79279 2.349475 ZT16-19 2.0771249999999997 2.0771249999999997 2.0771249999999997 ZT20-23 2.58434 2.58434 2.58434