condition mean min max ZT0-3 1.86910375925 0.48727697600000003 3.2509305425 ZT4-7 3.8000353762500003 2.3340723420000002 5.2659984105 ZT8-11 10.77360835775 5.842877302 15.7043394135 ZT12-15 35.842290035 33.022544214999996 38.662035855 ZT16-19 42.595860797499995 39.6282746 45.563446995 ZT20-23 19.102260239 15.108665483 23.095854995