condition mean min max ZT0-3 1.995009692 1.652440779 2.337578605 ZT4-7 1.851488603 1.66427398 2.038703226 ZT8-11 2.11144273475 1.762402531 2.4604829385 ZT12-15 2.1416596320000005 2.0884263995000003 2.1948928645000003 ZT16-19 1.7702938597499998 1.6315898894999998 1.90899783 ZT20-23 3.0540110645 2.6210326035000002 3.4869895255