condition mean min max ZT0-3 9.4549366255 3.661352976 15.248520274999999 ZT4-7 28.416999665000002 23.46159506 33.372404270000004 ZT8-11 33.871950275 32.96371910333333 34.78018144666667 ZT12-15 21.203245095 16.85672075 25.54976944 ZT16-19 9.302159218166667 7.850329581333334 10.753988855 ZT20-23 6.017165384666667 5.750144053666666 6.284186715666666